77948780 has 48 divisors (see below), whose sum is σ = 201472320. Its totient is φ = 24668928.

The previous prime is 77948779. The next prime is 77948807. The reversal of 77948780 is 8784977.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19595 + ... + 23234.

It is an arithmetic number, because the mean of its divisors is an integer number (4197340).

Almost surely, 2^77948780 is an apocalyptic number.

77948780 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77948780 is an abundant number, since it is smaller than the sum of its proper divisors (123523540).

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

77948780 is a wasteful number, since it uses less digits than its factorization.

77948780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42858 (or 42856 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 50.

The square root of 77948780 is about 8828.8606286429. The cubic root of 77948780 is about 427.1723239399.

The spelling of 77948780 in words is "seventy-seven million, nine hundred forty-eight thousand, seven hundred eighty".