161703640 has 32 divisors (see below), whose sum is σ = 415810080. Its totient is φ = 55441152.

The previous prime is 161703637. The next prime is 161703667. The reversal of 161703640 is 46307161.

161703640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161703640² = 52296134378499200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 161703599 and 161703608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288477 + ... + 289036.

It is an arithmetic number, because the mean of its divisors is an integer number (12994065).

Almost surely, 2^161703640 is an apocalyptic number.

161703640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161703640 is an abundant number, since it is smaller than the sum of its proper divisors (254106440).

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

161703640 is a wasteful number, since it uses less digits than its factorization.

161703640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577531 (or 577527 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 161703640 is about 12716.2746116935. The cubic root of 161703640 is about 544.8035540345.

The spelling of 161703640 in words is "one hundred sixty-one million, seven hundred three thousand, six hundred forty".