305161988 has 12 divisors (see below), whose sum is σ = 534757440. Its totient is φ = 152374152.

The previous prime is 305161981. The next prime is 305162027. The reversal of 305161988 is 889161503.

It is a super-2 number, since 2×305161988² = 186247677840224288, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (305161981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48368 + ... + 54311.

It is an arithmetic number, because the mean of its divisors is an integer number (44563120).

Almost surely, 2^305161988 is an apocalyptic number.

It is an amenable number.

305161988 is a deficient number, since it is larger than the sum of its proper divisors (229595452).

305161988 is a wasteful number, since it uses less digits than its factorization.

305161988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103426 (or 103424 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 305161988 is about 17468.8862839049. The cubic root of 305161988 is about 673.2506971968.

The spelling of 305161988 in words is "three hundred five million, one hundred sixty-one thousand, nine hundred eighty-eight".