78987474 has 160 divisors (see below), whose sum is σ = 206997120. Its totient is φ = 22353408.

The previous prime is 78987449. The next prime is 78987481. The reversal of 78987474 is 47478987.

It is a Harshad number since it is a multiple of its sum of digits (54).

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

Its product of digits (3161088) is a multiple of the sum of its prime factors (126).

It is a self number, because there is not a number n which added to its sum of digits gives 78987474.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1836897 + ... + 1836939.

It is an arithmetic number, because the mean of its divisors is an integer number (1293732).

Almost surely, 2^78987474 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78987474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103498560).

78987474 is an abundant number, since it is smaller than the sum of its proper divisors (128009646).

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

78987474 is a wasteful number, since it uses less digits than its factorization.

78987474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 117 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 54.

The square root of 78987474 is about 8887.4897468295. The cubic root of 78987474 is about 429.0613634165.

The spelling of 78987474 in words is "seventy-eight million, nine hundred eighty-seven thousand, four hundred seventy-four".