78998740 has 48 divisors (see below), whose sum is σ = 171686592. Its totient is φ = 30514176.

The previous prime is 78998723. The next prime is 78998741. The reversal of 78998740 is 4789987.

It is a happy number.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78998741) 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, 82947 + ... + 83893.

It is an arithmetic number, because the mean of its divisors is an integer number (3576804).

Almost surely, 2^78998740 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 78998740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85843296).

78998740 is an abundant number, since it is smaller than the sum of its proper divisors (92687852).

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

78998740 is a wasteful number, since it uses less digits than its factorization.

78998740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096 (or 1094 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 78998740 is about 8888.1235364952. The cubic root of 78998740 is about 429.0817614842.

The spelling of 78998740 in words is "seventy-eight million, nine hundred ninety-eight thousand, seven hundred forty".