1815136672 has 12 divisors (see below), whose sum is σ = 3573550386. Its totient is φ = 907568320.

The previous prime is 1815136667. The next prime is 1815136693. The reversal of 1815136672 is 2766315181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1221921936 + 593214736 = 34956^2 + 24356^2 .

It is a super-2 number, since 2×1815136672² = 6589442276078471168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28361479 + ... + 28361542.

Almost surely, 2^1815136672 is an apocalyptic number.

It is an amenable number.

1815136672 is a deficient number, since it is larger than the sum of its proper divisors (1758413714).

1815136672 is an equidigital number, since it uses as much as digits as its factorization.

1815136672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56723031 (or 56723023 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 1815136672 is about 42604.4208034800. The cubic root of 1815136672 is about 1219.8406743474.

The spelling of 1815136672 in words is "one billion, eight hundred fifteen million, one hundred thirty-six thousand, six hundred seventy-two".