78587440 has 20 divisors (see below), whose sum is σ = 182715984. Its totient is φ = 31434944.

The previous prime is 78587429. The next prime is 78587461. The reversal of 78587440 is 4478587.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491092 + ... + 491251.

Almost surely, 2^78587440 is an apocalyptic number.

It is an amenable number.

78587440 is an abundant number, since it is smaller than the sum of its proper divisors (104128544).

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

78587440 is a wasteful number, since it uses less digits than its factorization.

78587440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982356 (or 982350 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 43.

The square root of 78587440 is about 8864.9557246497. The cubic root of 78587440 is about 428.3358065670.

The spelling of 78587440 in words is "seventy-eight million, five hundred eighty-seven thousand, four hundred forty".