72155619 has 12 divisors (see below), whose sum is σ = 105934192. Its totient is φ = 47314800.

The previous prime is 72155543. The next prime is 72155621. The reversal of 72155619 is 91655127.

It is not a de Polignac number, because 72155619 - 2⁷ = 72155491 is a prime.

It is a super-2 number, since 2×72155619² = 10412866706546322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72155659) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 65167 + ... + 66264.

Almost surely, 2^72155619 is an apocalyptic number.

72155619 is a deficient number, since it is larger than the sum of its proper divisors (33778573).

72155619 is a wasteful number, since it uses less digits than its factorization.

72155619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131498 (or 131495 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 72155619 is about 8494.4463621828. The cubic root of 72155619 is about 416.3162716764.

The spelling of 72155619 in words is "seventy-two million, one hundred fifty-five thousand, six hundred nineteen".