1521472644 has 72 divisors (see below), whose sum is σ = 3888716832. Its totient is φ = 501552000.

The previous prime is 1521472607. The next prime is 1521472651. The reversal of 1521472644 is 4462741251.

1521472644 is a `hidden beast` number, since 1 + 5 + 2 + 1 + 4 + 7 + 2 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1521472599 and 1521472608.

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, 1472352 + ... + 1473384.

It is an arithmetic number, because the mean of its divisors is an integer number (54009956).

Almost surely, 2^1521472644 is an apocalyptic number.

It is an amenable number.

1521472644 is an abundant number, since it is smaller than the sum of its proper divisors (2367244188).

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

1521472644 is a wasteful number, since it uses less digits than its factorization.

1521472644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457 (or 1452 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 1521472644 is about 39006.0590677910. The cubic root of 1521472644 is about 1150.1506151817.

The spelling of 1521472644 in words is "one billion, five hundred twenty-one million, four hundred seventy-two thousand, six hundred forty-four".