72451998 has 12 divisors (see below), whose sum is σ = 156979368. Its totient is φ = 24150660.

The previous prime is 72451993. The next prime is 72452057. The reversal of 72451998 is 89915427.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72451993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2012538 + ... + 2012573.

It is an arithmetic number, because the mean of its divisors is an integer number (13081614).

Almost surely, 2^72451998 is an apocalyptic number.

72451998 is an abundant number, since it is smaller than the sum of its proper divisors (84527370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72451998 is a wasteful number, since it uses less digits than its factorization.

72451998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4025119 (or 4025116 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 72451998 is about 8511.8739417357. The cubic root of 72451998 is about 416.8854989875.

It can be divided in two parts, 7 and 2451998, that added together give a triangular number (2452005 = T₂₂₁₄).

The spelling of 72451998 in words is "seventy-two million, four hundred fifty-one thousand, nine hundred ninety-eight".