77806225 has 12 divisors (see below), whose sum is σ = 110262784. Its totient is φ = 53352720.

The previous prime is 77806219. The next prime is 77806241. The reversal of 77806225 is 52260877.

It is not a de Polignac number, because 77806225 - 2⁵ = 77806193 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 222129 + ... + 222478.

Almost surely, 2^77806225 is an apocalyptic number.

It is an amenable number.

77806225 is a deficient number, since it is larger than the sum of its proper divisors (32456559).

77806225 is a wasteful number, since it uses less digits than its factorization.

77806225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444624 (or 444619 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 77806225 is about 8820.7836953414. The cubic root of 77806225 is about 426.9117566335.

The spelling of 77806225 in words is "seventy-seven million, eight hundred six thousand, two hundred twenty-five".