72309497 has 16 divisors (see below), whose sum is σ = 82508160. Its totient is φ = 62819712.

The previous prime is 72309473. The next prime is 72309509. The reversal of 72309497 is 79490327.

It is a cyclic number.

It is not a de Polignac number, because 72309497 - 2⁸ = 72309241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72309427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40373 + ... + 42125.

It is an arithmetic number, because the mean of its divisors is an integer number (5156760).

Almost surely, 2^72309497 is an apocalyptic number.

It is an amenable number.

72309497 is a deficient number, since it is larger than the sum of its proper divisors (10198663).

72309497 is a wasteful number, since it uses less digits than its factorization.

72309497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1952.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 72309497 is about 8503.4991033104. The cubic root of 72309497 is about 416.6120048471.

The spelling of 72309497 in words is "seventy-two million, three hundred nine thousand, four hundred ninety-seven".