77215225 has 6 divisors (see below), whose sum is σ = 95746910. Its totient is φ = 61772160.

The previous prime is 77215213. The next prime is 77215231. The reversal of 77215225 is 52251277.

It can be written as a sum of positive squares in 3 ways, for example, as 17909824 + 59305401 = 4232^2 + 7701^2 .

It is not a de Polignac number, because 77215225 - 2⁷ = 77215097 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1544280 + ... + 1544329.

Almost surely, 2^77215225 is an apocalyptic number.

It is an amenable number.

77215225 is a deficient number, since it is larger than the sum of its proper divisors (18531685).

77215225 is a wasteful number, since it uses less digits than its factorization.

77215225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3088619 (or 3088614 counting only the distinct ones).

The product of its digits is 9800, while the sum is 31.

The square root of 77215225 is about 8787.2194123056. The cubic root of 77215225 is about 425.8280970843.

The spelling of 77215225 in words is "seventy-seven million, two hundred fifteen thousand, two hundred twenty-five".