73640665 has 8 divisors (see below), whose sum is σ = 100992960. Its totient is φ = 50496432.

The previous prime is 73640663. The next prime is 73640711. The reversal of 73640665 is 56604637.

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

It is not a de Polignac number, because 73640665 - 2¹ = 73640663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73640663) 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, 1051975 + ... + 1052044.

It is an arithmetic number, because the mean of its divisors is an integer number (12624120).

Almost surely, 2^73640665 is an apocalyptic number.

It is an amenable number.

73640665 is a deficient number, since it is larger than the sum of its proper divisors (27352295).

73640665 is a wasteful number, since it uses less digits than its factorization.

73640665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2104031.

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 73640665 is about 8581.4139277860. The cubic root of 73640665 is about 419.1529887534.

It can be divided in two parts, 73640 and 665, that added together give a triangular number (74305 = T₃₈₅).

The spelling of 73640665 in words is "seventy-three million, six hundred forty thousand, six hundred sixty-five".