77648940 has 144 divisors (see below), whose sum is σ = 246486240. Its totient is φ = 19768320.

The previous prime is 77648939. The next prime is 77648981. The reversal of 77648940 is 4984677.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 592675 + ... + 592805.

It is an arithmetic number, because the mean of its divisors is an integer number (1711710).

Almost surely, 2^77648940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77648940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123243120).

77648940 is an abundant number, since it is smaller than the sum of its proper divisors (168837300).

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

77648940 is a wasteful number, since it uses less digits than its factorization.

77648940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 77648940 is about 8811.8635940418. The cubic root of 77648940 is about 426.6238957234.

The spelling of 77648940 in words is "seventy-seven million, six hundred forty-eight thousand, nine hundred forty".