99977772 has 24 divisors (see below), whose sum is σ = 245560000. Its totient is φ = 31571856.

The previous prime is 99977771. The next prime is 99977797. The reversal of 99977772 is 27777999.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99977771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219022 + ... + 219477.

Almost surely, 2^99977772 is an apocalyptic number.

It is an amenable number.

99977772 is an abundant number, since it is smaller than the sum of its proper divisors (145582228).

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

99977772 is a wasteful number, since it uses less digits than its factorization.

99977772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438525 (or 438523 counting only the distinct ones).

The product of its digits is 3500658, while the sum is 57.

The square root of 99977772 is about 9998.8885382326. Note that the first 3 decimals coincide. The cubic root of 99977772 is about 464.1244897339.

The spelling of 99977772 in words is "ninety-nine million, nine hundred seventy-seven thousand, seven hundred seventy-two".