78811792 has 30 divisors (see below), whose sum is σ = 158171858. Its totient is φ = 38040576.

The previous prime is 78811781. The next prime is 78811793. The reversal of 78811792 is 29711887.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 32080896 + 46730896 = 5664^2 + 6836^2 .

It is a super-2 number, since 2×78811792² = 12422597116502528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78811793) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10528 + ... + 16384.

Almost surely, 2^78811792 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 78811792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79085929).

78811792 is an abundant number, since it is smaller than the sum of its proper divisors (79360066).

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

78811792 is a wasteful number, since it uses less digits than its factorization.

78811792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5923 (or 5888 counting only the distinct ones).

The product of its digits is 56448, while the sum is 43.

The square root of 78811792 is about 8877.6005767324. The cubic root of 78811792 is about 428.7430247033.

The spelling of 78811792 in words is "seventy-eight million, eight hundred eleven thousand, seven hundred ninety-two".