1521637672 has 16 divisors (see below), whose sum is σ = 2887446240. Its totient is φ = 751652016.

The previous prime is 1521637661. The next prime is 1521637679. The reversal of 1521637672 is 2767361251.

It is not an unprimeable number, because it can be changed into a prime (1521637679) 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, 1145148 + ... + 1146475.

It is an arithmetic number, because the mean of its divisors is an integer number (180465390).

Almost surely, 2^1521637672 is an apocalyptic number.

It is an amenable number.

1521637672 is a deficient number, since it is larger than the sum of its proper divisors (1365808568).

1521637672 is a wasteful number, since it uses less digits than its factorization.

1521637672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291712 (or 2291708 counting only the distinct ones).

The product of its digits is 105840, while the sum is 40.

The square root of 1521637672 is about 39008.1744253688. The cubic root of 1521637672 is about 1150.1921977442.

The spelling of 1521637672 in words is "one billion, five hundred twenty-one million, six hundred thirty-seven thousand, six hundred seventy-two".