72145569 has 8 divisors (see below), whose sum is σ = 101852640. Its totient is φ = 45267776.

The previous prime is 72145559. The next prime is 72145571. The reversal of 72145569 is 96554127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72145569 - 2⁴ = 72145553 is a prime.

It is a super-2 number, since 2×72145569² = 10409966252667522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72145559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 707259 + ... + 707360.

It is an arithmetic number, because the mean of its divisors is an integer number (12731580).

Almost surely, 2^72145569 is an apocalyptic number.

It is an amenable number.

72145569 is a deficient number, since it is larger than the sum of its proper divisors (29707071).

72145569 is a wasteful number, since it uses less digits than its factorization.

72145569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414639.

The product of its digits is 75600, while the sum is 39.

The square root of 72145569 is about 8493.8547786032. The cubic root of 72145569 is about 416.2969422841.

The spelling of 72145569 in words is "seventy-two million, one hundred forty-five thousand, five hundred sixty-nine".