78225722 has 4 divisors (see below), whose sum is σ = 117338586. Its totient is φ = 39112860.

The previous prime is 78225709. The next prime is 78225727. The reversal of 78225722 is 22752287.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 57441241 + 20784481 = 7579^2 + 4559^2 .

It is a super-2 number, since 2×78225722² = 12238527164842568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78225727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19556429 + ... + 19556432.

Almost surely, 2^78225722 is an apocalyptic number.

78225722 is a deficient number, since it is larger than the sum of its proper divisors (39112864).

78225722 is a wasteful number, since it uses less digits than its factorization.

78225722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39112863.

The product of its digits is 31360, while the sum is 35.

The square root of 78225722 is about 8844.5306263249. The cubic root of 78225722 is about 427.6776221187.

The spelling of 78225722 in words is "seventy-eight million, two hundred twenty-five thousand, seven hundred twenty-two".