618591690 has 48 divisors (see below), whose sum is σ = 1612564200. Its totient is φ = 164524416.

The previous prime is 618591661. The next prime is 618591703. The reversal of 618591690 is 96195816.

It can be written as a sum of positive squares in 4 ways, for example, as 322166601 + 296425089 = 17949^2 + 17217^2 .

It is a super-2 number, since 2×618591690² = 765311357874112200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26176 + ... + 43844.

Almost surely, 2^618591690 is an apocalyptic number.

618591690 is an abundant number, since it is smaller than the sum of its proper divisors (993972510).

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

618591690 is a wasteful number, since it uses less digits than its factorization.

618591690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18071 (or 18068 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 618591690 is about 24871.5035733669. The cubic root of 618591690 is about 852.0557805839.

The spelling of 618591690 in words is "six hundred eighteen million, five hundred ninety-one thousand, six hundred ninety".