72102818 has 4 divisors (see below), whose sum is σ = 108154230. Its totient is φ = 36051408.

The previous prime is 72102809. The next prime is 72102839. The reversal of 72102818 is 81820127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81820127 = 1217 ⋅67231.

It can be written as a sum of positive squares in only one way, i.e., 57410929 + 14691889 = 7577^2 + 3833^2 .

It is a super-2 number, since 2×72102818² = 10397632727082248, which contains 22 as substring.

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, 18025703 + ... + 18025706.

Almost surely, 2^72102818 is an apocalyptic number.

72102818 is a deficient number, since it is larger than the sum of its proper divisors (36051412).

72102818 is a wasteful number, since it uses less digits than its factorization.

72102818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36051411.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 72102818 is about 8491.3378215685. The cubic root of 72102818 is about 416.2146982540.

The spelling of 72102818 in words is "seventy-two million, one hundred two thousand, eight hundred eighteen".