79863840 has 384 divisors, whose sum is σ = 338688000. Its totient is φ = 17169408.

The previous prime is 79863827. The next prime is 79863881. The reversal of 79863840 is 4836897.

It is a happy number.

79863840 is a `hidden beast` number, since 7 + 9 + 8 + 638 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 574491 + ... + 574629.

It is an arithmetic number, because the mean of its divisors is an integer number (882000).

Almost surely, 2^79863840 is an apocalyptic number.

79863840 is a gapful number since it is divisible by the number (70) 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 79863840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169344000).

79863840 is an abundant number, since it is smaller than the sum of its proper divisors (258824160).

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

79863840 is a wasteful number, since it uses less digits than its factorization.

79863840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 79863840 is about 8936.6570931193. The cubic root of 79863840 is about 430.6423426639.

The spelling of 79863840 in words is "seventy-nine million, eight hundred sixty-three thousand, eight hundred forty".