77022561 has 96 divisors (see below), whose sum is σ = 144460800. Its totient is φ = 35925120.

The previous prime is 77022557. The next prime is 77022581. The reversal of 77022561 is 16522077.

It is not a de Polignac number, because 77022561 - 2² = 77022557 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77022511) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 706575 + ... + 706683.

It is an arithmetic number, because the mean of its divisors is an integer number (1504800).

Almost surely, 2^77022561 is an apocalyptic number.

It is an amenable number.

77022561 is a deficient number, since it is larger than the sum of its proper divisors (67438239).

77022561 is a wasteful number, since it uses less digits than its factorization.

77022561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 77022561 is about 8776.2498255234. The cubic root of 77022561 is about 425.4736329878.

The spelling of 77022561 in words is "seventy-seven million, twenty-two thousand, five hundred sixty-one".