99972015 has 96 divisors (see below), whose sum is σ = 200202240. Its totient is φ = 42197760.

The previous prime is 99972013. The next prime is 99972043. The reversal of 99972015 is 51027999.

It is not a de Polignac number, because 99972015 - 2¹ = 99972013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99972013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 448194 + ... + 448416.

It is an arithmetic number, because the mean of its divisors is an integer number (2085440).

Almost surely, 2^99972015 is an apocalyptic number.

99972015 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

99972015 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

99972015 is a wasteful number, since it uses less digits than its factorization.

99972015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 51030, while the sum is 42.

The square root of 99972015 is about 9998.6006520913. The cubic root of 99972015 is about 464.1155810338.

Subtracting from 99972015 its reverse (51027999), we obtain a square (48944016 = 6996²).

The spelling of 99972015 in words is "ninety-nine million, nine hundred seventy-two thousand, fifteen".