65678690 has 32 divisors (see below), whose sum is σ = 147394944. Its totient is φ = 20471040.

The previous prime is 65678681. The next prime is 65678699. The reversal of 65678690 is 9687656.

It is an interprime number because it is at equal distance from previous prime (65678681) and next prime (65678699).

It is a super-2 number, since 2×65678690² = 8627380640232200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (65678699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41879 + ... + 43418.

It is an arithmetic number, because the mean of its divisors is an integer number (4606092).

Almost surely, 2^65678690 is an apocalyptic number.

65678690 is an abundant number, since it is smaller than the sum of its proper divisors (81716254).

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

65678690 is a wasteful number, since it uses less digits than its factorization.

65678690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85322.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 65678690 is about 8104.2390142443. The cubic root of 65678690 is about 403.4671315012.

The spelling of 65678690 in words is "sixty-five million, six hundred seventy-eight thousand, six hundred ninety".