72194451 has 16 divisors (see below), whose sum is σ = 111081984. Its totient is φ = 40852224.

The previous prime is 72194431. The next prime is 72194467. The reversal of 72194451 is 15449127.

It is a happy number.

It is not a de Polignac number, because 72194451 - 2⁷ = 72194323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72194411) 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 15 ways as a sum of consecutive naturals, for example, 14526 + ... + 18851.

It is an arithmetic number, because the mean of its divisors is an integer number (6942624).

Almost surely, 2^72194451 is an apocalyptic number.

72194451 is a deficient number, since it is larger than the sum of its proper divisors (38887533).

72194451 is a wasteful number, since it uses less digits than its factorization.

72194451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33490.

The product of its digits is 10080, while the sum is 33.

The square root of 72194451 is about 8496.7317834565. The cubic root of 72194451 is about 416.3909412793.

The spelling of 72194451 in words is "seventy-two million, one hundred ninety-four thousand, four hundred fifty-one".