772071561 has 32 divisors (see below), whose sum is σ = 1165086720. Its totient is φ = 505222992.

The previous prime is 772071551. The next prime is 772071653. The reversal of 772071561 is 165170277.

772071561 is a `hidden beast` number, since 7 + 7 + 20 + 71 + 561 = 666.

It is not a de Polignac number, because 772071561 - 2⁶ = 772071497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (772071551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 373216 + ... + 375278.

It is an arithmetic number, because the mean of its divisors is an integer number (36408960).

Almost surely, 2^772071561 is an apocalyptic number.

It is an amenable number.

772071561 is a deficient number, since it is larger than the sum of its proper divisors (393015159).

772071561 is a wasteful number, since it uses less digits than its factorization.

772071561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2322 (or 2316 counting only the distinct ones).

The product of its (nonzero) digits is 20580, while the sum is 36.

The square root of 772071561 is about 27786.1757174319. The cubic root of 772071561 is about 917.3868668402.

The spelling of 772071561 in words is "seven hundred seventy-two million, seventy-one thousand, five hundred sixty-one".