1561272624 has 40 divisors (see below), whose sum is σ = 4481431920. Its totient is φ = 520424064.

The previous prime is 1561272619. The next prime is 1561272641. The reversal of 1561272624 is 4262721651.

It is a happy number.

1561272624 is a `hidden beast` number, since 1 + 5 + 6 + 1 + 27 + 2 + 624 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1806597 + ... + 1807460.

It is an arithmetic number, because the mean of its divisors is an integer number (112035798).

Almost surely, 2^1561272624 is an apocalyptic number.

It is an amenable number.

1561272624 is an abundant number, since it is smaller than the sum of its proper divisors (2920159296).

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

1561272624 is a wasteful number, since it uses less digits than its factorization.

1561272624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3614074 (or 3614062 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 1561272624 is about 39512.9424872408. The cubic root of 1561272624 is about 1160.0932901587.

The spelling of 1561272624 in words is "one billion, five hundred sixty-one million, two hundred seventy-two thousand, six hundred twenty-four".