72099531 has 24 divisors (see below), whose sum is σ = 124255440. Its totient is φ = 41198976.

The previous prime is 72099497. The next prime is 72099553. The reversal of 72099531 is 13599027.

It is not a de Polignac number, because 72099531 - 2⁹ = 72099019 is a prime.

It is a super-2 number, since 2×72099531² = 10396684740839922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72099331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25926 + ... + 28571.

It is an arithmetic number, because the mean of its divisors is an integer number (5177310).

Almost surely, 2^72099531 is an apocalyptic number.

72099531 is a deficient number, since it is larger than the sum of its proper divisors (52155909).

72099531 is a wasteful number, since it uses less digits than its factorization.

72099531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54520 (or 54507 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 72099531 is about 8491.1442691783. The cubic root of 72099531 is about 416.2083734041.

The spelling of 72099531 in words is "seventy-two million, ninety-nine thousand, five hundred thirty-one".