78737580 has 144 divisors (see below), whose sum is σ = 248609088. Its totient is φ = 20160000.

The previous prime is 78737573. The next prime is 78737621. The reversal of 78737580 is 8573787.

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, 779530 + ... + 779630.

It is an arithmetic number, because the mean of its divisors is an integer number (1726452).

Almost surely, 2^78737580 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 78737580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124304544).

78737580 is an abundant number, since it is smaller than the sum of its proper divisors (169871508).

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

78737580 is a wasteful number, since it uses less digits than its factorization.

78737580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The square root of 78737580 is about 8873.4198593327. The cubic root of 78737580 is about 428.6084091899.

The spelling of 78737580 in words is "seventy-eight million, seven hundred thirty-seven thousand, five hundred eighty".