78224425 has 12 divisors (see below), whose sum is σ = 102104080. Its totient is φ = 59285520.

The previous prime is 78224417. The next prime is 78224437. The reversal of 78224425 is 52442287.

It is not a de Polignac number, because 78224425 - 2³ = 78224417 is a prime.

It is a super-2 number, since 2×78224425² = 12238121333161250, which contains 22 as substring.

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, 81867 + ... + 82816.

Almost surely, 2^78224425 is an apocalyptic number.

It is an amenable number.

78224425 is a deficient number, since it is larger than the sum of its proper divisors (23879655).

78224425 is a wasteful number, since it uses less digits than its factorization.

78224425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164712 (or 164707 counting only the distinct ones).

The product of its digits is 35840, while the sum is 34.

The square root of 78224425 is about 8844.4573038712. The cubic root of 78224425 is about 427.6752584421.

The spelling of 78224425 in words is "seventy-eight million, two hundred twenty-four thousand, four hundred twenty-five".