618690988 has 12 divisors (see below), whose sum is σ = 1120044240. Its totient is φ = 298678352.

The previous prime is 618690983. The next prime is 618691037. The reversal of 618690988 is 889096816.

It is a super-2 number, since 2×618690988² = 765557077264832288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (618690983) 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, 2666656 + ... + 2666887.

It is an arithmetic number, because the mean of its divisors is an integer number (93337020).

Almost surely, 2^618690988 is an apocalyptic number.

It is an amenable number.

618690988 is a deficient number, since it is larger than the sum of its proper divisors (501353252).

618690988 is a wasteful number, since it uses less digits than its factorization.

618690988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5333576 (or 5333574 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 55.

The square root of 618690988 is about 24873.4997135506. The cubic root of 618690988 is about 852.1013695723.

The spelling of 618690988 in words is "six hundred eighteen million, six hundred ninety thousand, nine hundred eighty-eight".