72151775 has 12 divisors (see below), whose sum is σ = 89577600. Its totient is φ = 57650880.

The previous prime is 72151771. The next prime is 72151789. The reversal of 72151775 is 57715127.

It is a happy number.

It is not a de Polignac number, because 72151775 - 2² = 72151771 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72151771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31106 + ... + 33344.

It is an arithmetic number, because the mean of its divisors is an integer number (7464800).

Almost surely, 2^72151775 is an apocalyptic number.

72151775 is a deficient number, since it is larger than the sum of its proper divisors (17425825).

72151775 is a wasteful number, since it uses less digits than its factorization.

72151775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3538 (or 3533 counting only the distinct ones).

The product of its digits is 17150, while the sum is 35.

The square root of 72151775 is about 8494.2200936872. The cubic root of 72151775 is about 416.3088786363.

The spelling of 72151775 in words is "seventy-two million, one hundred fifty-one thousand, seven hundred seventy-five".