78097644 has 72 divisors (see below), whose sum is σ = 204055488. Its totient is φ = 25171200.

The previous prime is 78097601. The next prime is 78097681. The reversal of 78097644 is 44679087.

It is a self number, because there is not a number n which added to its sum of digits gives 78097644.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 170664 + ... + 171120.

It is an arithmetic number, because the mean of its divisors is an integer number (2834104).

Almost surely, 2^78097644 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 78097644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102027744).

78097644 is an abundant number, since it is smaller than the sum of its proper divisors (125957844).

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

78097644 is a wasteful number, since it uses less digits than its factorization.

78097644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615 (or 610 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 78097644 is about 8837.2871402937. The cubic root of 78097644 is about 427.4440842020. Note that the first 3 decimals are identical.

The spelling of 78097644 in words is "seventy-eight million, ninety-seven thousand, six hundred forty-four".