78887740 has 12 divisors (see below), whose sum is σ = 165664296. Its totient is φ = 31555088.

The previous prime is 78887719. The next prime is 78887749. The reversal of 78887740 is 4778887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78887749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1972174 + ... + 1972213.

It is an arithmetic number, because the mean of its divisors is an integer number (13805358).

Almost surely, 2^78887740 is an apocalyptic number.

It is an amenable number.

78887740 is an abundant number, since it is smaller than the sum of its proper divisors (86776556).

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

78887740 is a wasteful number, since it uses less digits than its factorization.

78887740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3944396 (or 3944394 counting only the distinct ones).

The product of its (nonzero) digits is 702464, while the sum is 49.

The square root of 78887740 is about 8881.8770538665. The cubic root of 78887740 is about 428.8807017368.

The spelling of 78887740 in words is "seventy-eight million, eight hundred eighty-seven thousand, seven hundred forty".