78847992 has 80 divisors (see below), whose sum is σ = 222156000. Its totient is φ = 26127360.

The previous prime is 78847991. The next prime is 78847997. The reversal of 78847992 is 29974887.

78847992 is a `hidden beast` number, since 7 + 88 + 479 + 92 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78847991) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 175384 + ... + 175832.

It is an arithmetic number, because the mean of its divisors is an integer number (2776950).

Almost surely, 2^78847992 is an apocalyptic number.

78847992 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78847992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111078000).

78847992 is an abundant number, since it is smaller than the sum of its proper divisors (143308008).

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

78847992 is a wasteful number, since it uses less digits than its factorization.

78847992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738 (or 725 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 78847992 is about 8879.6391818587. The cubic root of 78847992 is about 428.8086583748.

It can be divided in two parts, 7884 and 7992, that added together give a square (15876 = 126²).

The spelling of 78847992 in words is "seventy-eight million, eight hundred forty-seven thousand, nine hundred ninety-two".