65312490 has 16 divisors (see below), whose sum is σ = 156750048. Its totient is φ = 17416656.

The previous prime is 65312449. The next prime is 65312491. The reversal of 65312490 is 9421356.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2177083 = 65312490 / (6 + 5 + 3 + 1 + 2 + 4 + 9 + 0).

It is not an unprimeable number, because it can be changed into a prime (65312491) 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, 1088512 + ... + 1088571.

It is an arithmetic number, because the mean of its divisors is an integer number (9796878).

Almost surely, 2^65312490 is an apocalyptic number.

65312490 is an abundant number, since it is smaller than the sum of its proper divisors (91437558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65312490 is a wasteful number, since it uses less digits than its factorization.

65312490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2177093.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 65312490 is about 8081.6143189341. The cubic root of 65312490 is about 402.7158725240.

The spelling of 65312490 in words is "sixty-five million, three hundred twelve thousand, four hundred ninety".