75240065 has 16 divisors (see below), whose sum is σ = 93664080. Its totient is φ = 58022272.

The previous prime is 75240059. The next prime is 75240073. The reversal of 75240065 is 56004257.

It can be written as a sum of positive squares in 8 ways, for example, as 33779344 + 41460721 = 5812^2 + 6439^2 .

It is not a de Polignac number, because 75240065 - 2⁶ = 75240001 is a prime.

It is a super-2 number, since 2×75240065² = 11322134762408450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121637 + ... + 122253.

It is an arithmetic number, because the mean of its divisors is an integer number (5854005).

Almost surely, 2^75240065 is an apocalyptic number.

It is an amenable number.

75240065 is a deficient number, since it is larger than the sum of its proper divisors (18424015).

75240065 is an frugal number, since it uses more digits than its factorization.

75240065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 75240065 is about 8674.1031236664. The cubic root of 75240065 is about 422.1658060073.

The spelling of 75240065 in words is "seventy-five million, two hundred forty thousand, sixty-five".