1561606772 has 48 divisors (see below), whose sum is σ = 3143024640. Its totient is φ = 672280800.

The previous prime is 1561606747. The next prime is 1561606799. The reversal of 1561606772 is 2776061651.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51929 + ... + 76287.

It is an arithmetic number, because the mean of its divisors is an integer number (65479680).

Almost surely, 2^1561606772 is an apocalyptic number.

It is an amenable number.

1561606772 is an abundant number, since it is smaller than the sum of its proper divisors (1581417868).

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

1561606772 is a wasteful number, since it uses less digits than its factorization.

1561606772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24452 (or 24450 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 1561606772 is about 39517.1705970961. The cubic root of 1561606772 is about 1160.1760464083.

The spelling of 1561606772 in words is "one billion, five hundred sixty-one million, six hundred six thousand, seven hundred seventy-two".