77699844 has 48 divisors (see below), whose sum is σ = 204301440. Its totient is φ = 25532640.

The previous prime is 77699827. The next prime is 77699851. The reversal of 77699844 is 44899677.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2602 + ... + 12734.

It is an arithmetic number, because the mean of its divisors is an integer number (4256280).

Almost surely, 2^77699844 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 77699844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102150720).

77699844 is an abundant number, since it is smaller than the sum of its proper divisors (126601596).

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

77699844 is a wasteful number, since it uses less digits than its factorization.

77699844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10217 (or 10209 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 77699844 is about 8814.7514996170. The cubic root of 77699844 is about 426.7171020566.

The spelling of 77699844 in words is "seventy-seven million, six hundred ninety-nine thousand, eight hundred forty-four".