78781872 has 80 divisors (see below), whose sum is σ = 220485888. Its totient is φ = 24096000.

The previous prime is 78781867. The next prime is 78781873. The reversal of 78781872 is 27818787.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (78781873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156373 + ... + 156875.

Almost surely, 2^78781872 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 78781872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110242944).

78781872 is an abundant number, since it is smaller than the sum of its proper divisors (141704016).

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

78781872 is a wasteful number, since it uses less digits than its factorization.

78781872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778 (or 772 counting only the distinct ones).

The product of its digits is 351232, while the sum is 48.

The square root of 78781872 is about 8875.9152767475. The cubic root of 78781872 is about 428.6887620325.

The spelling of 78781872 in words is "seventy-eight million, seven hundred eighty-one thousand, eight hundred seventy-two".