72224998 has 4 divisors (see below), whose sum is σ = 108337500. Its totient is φ = 36112498.

The previous prime is 72224989. The next prime is 72225029. The reversal of 72224998 is 89942227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89942227 = 37 ⋅2430871.

It is a super-2 number, since 2×72224998² = 10432900672200008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18056248 + ... + 18056251.

It is an arithmetic number, because the mean of its divisors is an integer number (27084375).

Almost surely, 2^72224998 is an apocalyptic number.

72224998 is a deficient number, since it is larger than the sum of its proper divisors (36112502).

72224998 is a wasteful number, since it uses less digits than its factorization.

72224998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36112501.

The product of its digits is 145152, while the sum is 43.

The square root of 72224998 is about 8498.5291668618. The cubic root of 72224998 is about 416.4496609378.

The spelling of 72224998 in words is "seventy-two million, two hundred twenty-four thousand, nine hundred ninety-eight".