618807978 has 16 divisors (see below), whose sum is σ = 1375128960. Its totient is φ = 206269308.

The previous prime is 618807949. The next prime is 618807983. The reversal of 618807978 is 879708816.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 11459407 = 618807978 / (6 + 1 + 8 + 8 + 0 + 7 + 9 + 7 + 8).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5729650 + ... + 5729757.

It is an arithmetic number, because the mean of its divisors is an integer number (85945560).

Almost surely, 2^618807978 is an apocalyptic number.

618807978 is an abundant number, since it is smaller than the sum of its proper divisors (756320982).

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

618807978 is a wasteful number, since it uses less digits than its factorization.

618807978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11459418 (or 11459412 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 54.

The square root of 618807978 is about 24875.8513020158. The cubic root of 618807978 is about 852.1550749268.

The spelling of 618807978 in words is "six hundred eighteen million, eight hundred seven thousand, nine hundred seventy-eight".