77970776 has 32 divisors (see below), whose sum is σ = 157852800. Its totient is φ = 35892480.

The previous prime is 77970773. The next prime is 77970811. The reversal of 77970776 is 67707977.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77970773) 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, 53465 + ... + 54903.

It is an arithmetic number, because the mean of its divisors is an integer number (4932900).

Almost surely, 2^77970776 is an apocalyptic number.

It is an amenable number.

77970776 is an abundant number, since it is smaller than the sum of its proper divisors (79882024).

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

77970776 is a wasteful number, since it uses less digits than its factorization.

77970776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979 (or 1975 counting only the distinct ones).

The product of its (nonzero) digits is 907578, while the sum is 50.

The square root of 77970776 is about 8830.1062281266. The cubic root of 77970776 is about 427.2125007447.

The spelling of 77970776 in words is "seventy-seven million, nine hundred seventy thousand, seven hundred seventy-six".