77704272 has 50 divisors (see below), whose sum is σ = 224902458. Its totient is φ = 25900992.

The previous prime is 77704271. The next prime is 77704313. The reversal of 77704272 is 27240777.

It can be written as a sum of positive squares in only one way, i.e., 59351616 + 18352656 = 7704^2 + 4284^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77704271) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 28683 + ... + 31274.

Almost surely, 2^77704272 is an apocalyptic number.

77704272 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

77704272 is an abundant number, since it is smaller than the sum of its proper divisors (147198186).

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

77704272 is a wasteful number, since it uses less digits than its factorization.

77704272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59977 (or 59962 counting only the distinct ones).

The product of its (nonzero) digits is 38416, while the sum is 36.

The square root of 77704272 is about 8815.0026659100. The cubic root of 77704272 is about 426.7252078962.

The spelling of 77704272 in words is "seventy-seven million, seven hundred four thousand, two hundred seventy-two".