72503989 has 4 divisors (see below), whose sum is σ = 72521280. Its totient is φ = 72486700.

The previous prime is 72503971. The next prime is 72504007. The reversal of 72503989 is 98930527.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98930527 = 1993 ⋅49639.

It is an interprime number because it is at equal distance from previous prime (72503971) and next prime (72504007).

It is a cyclic number.

It is not a de Polignac number, because 72503989 - 2⁵ = 72503957 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 (72503969) 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, 2082 + ... + 12220.

It is an arithmetic number, because the mean of its divisors is an integer number (18130320).

Almost surely, 2^72503989 is an apocalyptic number.

It is an amenable number.

72503989 is a deficient number, since it is larger than the sum of its proper divisors (17291).

72503989 is a wasteful number, since it uses less digits than its factorization.

72503989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17290.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 72503989 is about 8514.9274218868. The cubic root of 72503989 is about 416.9851930939.

The spelling of 72503989 in words is "seventy-two million, five hundred three thousand, nine hundred eighty-nine".