77228956 has 24 divisors (see below), whose sum is σ = 155576960. Its totient is φ = 32858352.

The previous prime is 77228951. The next prime is 77228969. The reversal of 77228956 is 65982277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77228951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6030 + ... + 13813.

Almost surely, 2^77228956 is an apocalyptic number.

It is an amenable number.

77228956 is an abundant number, since it is smaller than the sum of its proper divisors (78348004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77228956 is a wasteful number, since it uses less digits than its factorization.

77228956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19993 (or 19991 counting only the distinct ones).

The product of its digits is 423360, while the sum is 46.

The square root of 77228956 is about 8788.0006827492. Note that the first 3 decimals coincide. The cubic root of 77228956 is about 425.8533369211.

The spelling of 77228956 in words is "seventy-seven million, two hundred twenty-eight thousand, nine hundred fifty-six".