77450720 has 24 divisors (see below), whose sum is σ = 182977704. Its totient is φ = 30980224.

The previous prime is 77450719. The next prime is 77450743. The reversal of 77450720 is 2705477.

It is a happy number.

It is a super-2 number, since 2×77450720² = 11997228057036800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241874 + ... + 242193.

It is an arithmetic number, because the mean of its divisors is an integer number (7624071).

Almost surely, 2^77450720 is an apocalyptic number.

It is an amenable number.

77450720 is an abundant number, since it is smaller than the sum of its proper divisors (105526984).

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

77450720 is a wasteful number, since it uses less digits than its factorization.

77450720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484082 (or 484074 counting only the distinct ones).

The product of its (nonzero) digits is 13720, while the sum is 32.

The square root of 77450720 is about 8800.6090698315. The cubic root of 77450720 is about 426.2605619396.

The spelling of 77450720 in words is "seventy-seven million, four hundred fifty thousand, seven hundred twenty".