305742978 has 16 divisors (see below), whose sum is σ = 679428960. Its totient is φ = 101914308.

The previous prime is 305742971. The next prime is 305742991. The reversal of 305742978 is 879247503.

305742978 is a `hidden beast` number, since 3 + 0 + 574 + 2 + 9 + 78 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (305742971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2830900 + ... + 2831007.

It is an arithmetic number, because the mean of its divisors is an integer number (42464310).

Almost surely, 2^305742978 is an apocalyptic number.

305742978 is an abundant number, since it is smaller than the sum of its proper divisors (373685982).

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

305742978 is a wasteful number, since it uses less digits than its factorization.

305742978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5661918 (or 5661912 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 305742978 is about 17485.5076563422. The cubic root of 305742978 is about 673.6776878504.

The spelling of 305742978 in words is "three hundred five million, seven hundred forty-two thousand, nine hundred seventy-eight".