1561652772 has 24 divisors (see below), whose sum is σ = 3732732192. Its totient is φ = 507854400.

The previous prime is 1561652749. The next prime is 1561652773. The reversal of 1561652772 is 2772561651.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1561652773) 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, 1586554 + ... + 1587537.

It is an arithmetic number, because the mean of its divisors is an integer number (155530508).

Almost surely, 2^1561652772 is an apocalyptic number.

1561652772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1561652772 is an abundant number, since it is smaller than the sum of its proper divisors (2171079420).

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

1561652772 is a wasteful number, since it uses less digits than its factorization.

1561652772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3174139 (or 3174137 counting only the distinct ones).

The product of its digits is 176400, while the sum is 42.

The square root of 1561652772 is about 39517.7526182854. The cubic root of 1561652772 is about 1160.1874380030.

The spelling of 1561652772 in words is "one billion, five hundred sixty-one million, six hundred fifty-two thousand, seven hundred seventy-two".