618157988 has 24 divisors (see below), whose sum is σ = 1241140992. Its totient is φ = 263890944.

The previous prime is 618157979. The next prime is 618157999. The reversal of 618157988 is 889751816.

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, 35756 + ... + 50147.

It is an arithmetic number, because the mean of its divisors is an integer number (51714208).

Almost surely, 2^618157988 is an apocalyptic number.

It is an amenable number.

618157988 is an abundant number, since it is smaller than the sum of its proper divisors (622983004).

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

618157988 is a wasteful number, since it uses less digits than its factorization.

618157988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86171 (or 86169 counting only the distinct ones).

The product of its digits is 967680, while the sum is 53.

The square root of 618157988 is about 24862.7831909463. The cubic root of 618157988 is about 851.8566052106.

The spelling of 618157988 in words is "six hundred eighteen million, one hundred fifty-seven thousand, nine hundred eighty-eight".