161634630 has 64 divisors (see below), whose sum is σ = 402174720. Its totient is φ = 41548416.

The previous prime is 161634617. The next prime is 161634631. The reversal of 161634630 is 36436161.

161634630 = 265² + 266² + ... + 795².

It is a super-2 number, since 2×161634630² = 52251507230473800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161634631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92949 + ... + 94671.

It is an arithmetic number, because the mean of its divisors is an integer number (6283980).

Almost surely, 2^161634630 is an apocalyptic number.

161634630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161634630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201087360).

161634630 is an abundant number, since it is smaller than the sum of its proper divisors (240540090).

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

161634630 is a wasteful number, since it uses less digits than its factorization.

161634630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 161634630 is about 12713.5608701890. The cubic root of 161634630 is about 544.7260413639.

The spelling of 161634630 in words is "one hundred sixty-one million, six hundred thirty-four thousand, six hundred thirty".