161584780 has 24 divisors (see below), whose sum is σ = 387803808. Its totient is φ = 55400448.

The previous prime is 161584777. The next prime is 161584799. The reversal of 161584780 is 87485161.

It is a super-2 number, since 2×161584780² = 52219282255296800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

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, 576949 + ... + 577228.

It is an arithmetic number, because the mean of its divisors is an integer number (16158492).

Almost surely, 2^161584780 is an apocalyptic number.

161584780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161584780 is an abundant number, since it is smaller than the sum of its proper divisors (226219028).

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

161584780 is a wasteful number, since it uses less digits than its factorization.

161584780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154193 (or 1154191 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 161584780 is about 12711.6002139778. The cubic root of 161584780 is about 544.6700356568.

The spelling of 161584780 in words is "one hundred sixty-one million, five hundred eighty-four thousand, seven hundred eighty".