1618640904 has 32 divisors (see below), whose sum is σ = 4049892000. Its totient is φ = 539108352.

The previous prime is 1618640897. The next prime is 1618640909. The reversal of 1618640904 is 4090468161.

It is a super-2 number, since 2×1618640904² = 5239996752203874432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1618640909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3432 + ... + 57000.

It is an arithmetic number, because the mean of its divisors is an integer number (126559125).

Almost surely, 2^1618640904 is an apocalyptic number.

It is an amenable number.

1618640904 is an abundant number, since it is smaller than the sum of its proper divisors (2431251096).

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

1618640904 is a wasteful number, since it uses less digits than its factorization.

1618640904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54837 (or 54833 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 1618640904 is about 40232.3365466138. The cubic root of 1618640904 is about 1174.1317633648.

The spelling of 1618640904 in words is "one billion, six hundred eighteen million, six hundred forty thousand, nine hundred four".