161624394 has 24 divisors (see below), whose sum is σ = 352864512. Its totient is φ = 53462760.

The previous prime is 161624387. The next prime is 161624429. The reversal of 161624394 is 493426161.

161624394 is a `hidden beast` number, since 1 + 616 + 2 + 4 + 39 + 4 = 666.

It is a super-2 number, since 2×161624394² = 52244889471734472, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31914 + ... + 36629.

It is an arithmetic number, because the mean of its divisors is an integer number (14702688).

Almost surely, 2^161624394 is an apocalyptic number.

161624394 is an abundant number, since it is smaller than the sum of its proper divisors (191240118).

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

161624394 is a wasteful number, since it uses less digits than its factorization.

161624394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68682 (or 68679 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 161624394 is about 12713.1583015394. The cubic root of 161624394 is about 544.7145423152.

The spelling of 161624394 in words is "one hundred sixty-one million, six hundred twenty-four thousand, three hundred ninety-four".