161174640 has 80 divisors (see below), whose sum is σ = 545072256. Its totient is φ = 39072000.

The previous prime is 161174617. The next prime is 161174647. The reversal of 161174640 is 46471161.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a junction number, because it is equal to n+sod(n) for n = 161174598 and 161174607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161174647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27886 + ... + 33165.

Almost surely, 2^161174640 is an apocalyptic number.

161174640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161174640 is an abundant number, since it is smaller than the sum of its proper divisors (383897616).

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

161174640 is a wasteful number, since it uses less digits than its factorization.

161174640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61078 (or 61072 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 161174640 is about 12695.4574553263. The cubic root of 161174640 is about 544.2088118510.

The spelling of 161174640 in words is "one hundred sixty-one million, one hundred seventy-four thousand, six hundred forty".