618420978 has 48 divisors (see below), whose sum is σ = 1547145600. Its totient is φ = 174866688.

The previous prime is 618420973. The next prime is 618420991. The reversal of 618420978 is 879024816.

618420978 is a `hidden beast` number, since 618 + 4 + 20 + 9 + 7 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (618420973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13078 + ... + 37521.

It is an arithmetic number, because the mean of its divisors is an integer number (32232200).

Almost surely, 2^618420978 is an apocalyptic number.

618420978 is an abundant number, since it is smaller than the sum of its proper divisors (928724622).

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

618420978 is a wasteful number, since it uses less digits than its factorization.

618420978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50711 (or 50708 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 618420978 is about 24868.0714571919. The cubic root of 618420978 is about 851.9773931051.

The spelling of 618420978 in words is "six hundred eighteen million, four hundred twenty thousand, nine hundred seventy-eight".