72490997 has 4 divisors (see below), whose sum is σ = 73679436. Its totient is φ = 71302560.

The previous prime is 72490973. The next prime is 72491017. The reversal of 72490997 is 79909427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79909427 = 13 ⋅6146879.

It can be written as a sum of positive squares in 2 ways, for example, as 10491121 + 61999876 = 3239^2 + 7874^2 .

It is a cyclic number.

It is not a de Polignac number, because 72490997 - 2⁶ = 72490933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72490937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594128 + ... + 594249.

It is an arithmetic number, because the mean of its divisors is an integer number (18419859).

Almost surely, 2^72490997 is an apocalyptic number.

It is an amenable number.

72490997 is a deficient number, since it is larger than the sum of its proper divisors (1188439).

72490997 is a wasteful number, since it uses less digits than its factorization.

72490997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188438.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 72490997 is about 8514.1644921859. The cubic root of 72490997 is about 416.9602850609.

The spelling of 72490997 in words is "seventy-two million, four hundred ninety thousand, nine hundred ninety-seven".