72145015 has 4 divisors (see below), whose sum is σ = 86574024. Its totient is φ = 57716008.

The previous prime is 72145001. The next prime is 72145019. The reversal of 72145015 is 51054127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72145015 - 2⁷ = 72144887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72145019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7214497 + ... + 7214506.

It is an arithmetic number, because the mean of its divisors is an integer number (21643506).

Almost surely, 2^72145015 is an apocalyptic number.

72145015 is a deficient number, since it is larger than the sum of its proper divisors (14429009).

72145015 is a wasteful number, since it uses less digits than its factorization.

72145015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14429008.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 72145015 is about 8493.8221667280. The cubic root of 72145015 is about 416.2958767112.

The spelling of 72145015 in words is "seventy-two million, one hundred forty-five thousand, fifteen".