161687040 has 160 divisors (see below), whose sum is σ = 531796320. Its totient is φ = 41877504.

The previous prime is 161687021. The next prime is 161687059. The reversal of 161687040 is 40786161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (161687021) and next prime (161687059).

It is a tau number, because it is divible by the number of its divisors (160).

It is a super-2 number, since 2×161687040² = 52285397807923200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161686992 and 161687010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283876 + ... + 284444.

It is an arithmetic number, because the mean of its divisors is an integer number (3323727).

Almost surely, 2^161687040 is an apocalyptic number.

161687040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161687040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265898160).

161687040 is an abundant number, since it is smaller than the sum of its proper divisors (370109280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161687040 is an equidigital number, since it uses as much as digits as its factorization.

161687040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 161687040 is about 12715.6218880557. The cubic root of 161687040 is about 544.7849107756.

The spelling of 161687040 in words is "one hundred sixty-one million, six hundred eighty-seven thousand, forty".