77489712 has 30 divisors (see below), whose sum is σ = 216863972. Its totient is φ = 25829856.

The previous prime is 77489701. The next prime is 77489743. The reversal of 77489712 is 21798477.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 268918 + ... + 269205.

Almost surely, 2^77489712 is an apocalyptic number.

77489712 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

77489712 is an abundant number, since it is smaller than the sum of its proper divisors (139374260).

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

77489712 is a wasteful number, since it uses less digits than its factorization.

77489712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538137 (or 538128 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 77489712 is about 8802.8240923013. The cubic root of 77489712 is about 426.3320825289.

The spelling of 77489712 in words is "seventy-seven million, four hundred eighty-nine thousand, seven hundred twelve".