618402478 has 4 divisors (see below), whose sum is σ = 927603720. Its totient is φ = 309201238.

The previous prime is 618402469. The next prime is 618402487. The reversal of 618402478 is 874204816.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (618402469) and next prime (618402487).

It is a self number, because there is not a number n which added to its sum of digits gives 618402478.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154600618 + ... + 154600621.

It is an arithmetic number, because the mean of its divisors is an integer number (231900930).

Almost surely, 2^618402478 is an apocalyptic number.

618402478 is a deficient number, since it is larger than the sum of its proper divisors (309201242).

618402478 is a wasteful number, since it uses less digits than its factorization.

618402478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309201241.

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 618402478 is about 24867.6994915091. The cubic root of 618402478 is about 851.9688974150.

The spelling of 618402478 in words is "six hundred eighteen million, four hundred two thousand, four hundred seventy-eight".