77371440 has 80 divisors (see below), whose sum is σ = 246362208. Its totient is φ = 20072448.

The previous prime is 77371423. The next prime is 77371451. The reversal of 77371440 is 4417377.

It is a tau number, because it is divible by the number of its divisors (80).

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, 4524 + ... + 13236.

Almost surely, 2^77371440 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 77371440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123181104).

77371440 is an abundant number, since it is smaller than the sum of its proper divisors (168990768).

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

77371440 is a wasteful number, since it uses less digits than its factorization.

77371440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8766 (or 8760 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 33.

The square root of 77371440 is about 8796.1036828814. The cubic root of 77371440 is about 426.1150695344.

The spelling of 77371440 in words is "seventy-seven million, three hundred seventy-one thousand, four hundred forty".