77738980 has 24 divisors (see below), whose sum is σ = 178093440. Its totient is φ = 28268640.

The previous prime is 77738963. The next prime is 77738981. The reversal of 77738980 is 8983777.

It is a happy number.

It is a super-2 number, since 2×77738980² = 12086698022880800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77738981) 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, 176460 + ... + 176899.

It is an arithmetic number, because the mean of its divisors is an integer number (7420560).

Almost surely, 2^77738980 is an apocalyptic number.

It is an amenable number.

77738980 is an abundant number, since it is smaller than the sum of its proper divisors (100354460).

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

77738980 is a wasteful number, since it uses less digits than its factorization.

77738980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353379 (or 353377 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 49.

The square root of 77738980 is about 8816.9711352595. The cubic root of 77738980 is about 426.7887332491.

The spelling of 77738980 in words is "seventy-seven million, seven hundred thirty-eight thousand, nine hundred eighty".