99772644 has 24 divisors (see below), whose sum is σ = 240831360. Its totient is φ = 32110624.

The previous prime is 99772633. The next prime is 99772657. The reversal of 99772644 is 44627799.

It is a junction number, because it is equal to n+sod(n) for n = 99772593 and 99772602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143004 + ... + 143699.

It is an arithmetic number, because the mean of its divisors is an integer number (10034640).

Almost surely, 2^99772644 is an apocalyptic number.

It is an amenable number.

99772644 is an abundant number, since it is smaller than the sum of its proper divisors (141058716).

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

99772644 is a wasteful number, since it uses less digits than its factorization.

99772644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286739 (or 286737 counting only the distinct ones).

The product of its digits is 762048, while the sum is 48.

The square root of 99772644 is about 9988.6257313006. The cubic root of 99772644 is about 463.8068520813.

It can be divided in two parts, 9977 and 2644, that added together give a palindrome (12621).

The spelling of 99772644 in words is "ninety-nine million, seven hundred seventy-two thousand, six hundred forty-four".