99947772 has 36 divisors (see below), whose sum is σ = 253006936. Its totient is φ = 33268320.

The previous prime is 99947747. The next prime is 99947789. The reversal of 99947772 is 27774999.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31122 + ... + 34182.

Almost surely, 2^99947772 is an apocalyptic number.

99947772 is the 8163-rd pentagonal number.

It is an amenable number.

99947772 is an abundant number, since it is smaller than the sum of its proper divisors (153059164).

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

99947772 is a wasteful number, since it uses less digits than its factorization.

99947772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3978 (or 3973 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 54.

The square root of 99947772 is about 9997.3882589404. The cubic root of 99947772 is about 464.0780623220.

It can be divided in two parts, 9994 and 7772, that added together give a triangular number (17766 = T₁₈₈).

The spelling of 99947772 in words is "ninety-nine million, nine hundred forty-seven thousand, seven hundred seventy-two".