77738672 has 20 divisors (see below), whose sum is σ = 164311656. Its totient is φ = 35335680.

The previous prime is 77738657. The next prime is 77738677. The reversal of 77738672 is 27683777.

It is a super-2 number, since 2×77738672² = 12086602248647168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77738677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220673 + ... + 221024.

Almost surely, 2^77738672 is an apocalyptic number.

It is an amenable number.

77738672 is an abundant number, since it is smaller than the sum of its proper divisors (86572984).

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

77738672 is a wasteful number, since it uses less digits than its factorization.

77738672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441716 (or 441710 counting only the distinct ones).

The product of its digits is 691488, while the sum is 47.

The square root of 77738672 is about 8816.9536689267. The cubic root of 77738672 is about 426.7881696061.

The spelling of 77738672 in words is "seventy-seven million, seven hundred thirty-eight thousand, six hundred seventy-two".