72191955 has 16 divisors (see below), whose sum is σ = 126008064. Its totient is φ = 35002080.

The previous prime is 72191947. The next prime is 72191957. The reversal of 72191955 is 55919127.

It is not a de Polignac number, because 72191955 - 2³ = 72191947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72191957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218599 + ... + 218928.

It is an arithmetic number, because the mean of its divisors is an integer number (7875504).

Almost surely, 2^72191955 is an apocalyptic number.

72191955 is a deficient number, since it is larger than the sum of its proper divisors (53816109).

72191955 is a wasteful number, since it uses less digits than its factorization.

72191955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437546.

The product of its digits is 28350, while the sum is 39.

The square root of 72191955 is about 8496.5849021828. The cubic root of 72191955 is about 416.3861425551.

The spelling of 72191955 in words is "seventy-two million, one hundred ninety-one thousand, nine hundred fifty-five".