65940990 has 32 divisors (see below), whose sum is σ = 160043040. Its totient is φ = 17385984.

The previous prime is 65940989. The next prime is 65940991. The reversal of 65940990 is 9904956.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (65940989) and next prime (65940991).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65940991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9679 + ... + 15018.

It is an arithmetic number, because the mean of its divisors is an integer number (5001345).

Almost surely, 2^65940990 is an apocalyptic number.

65940990 is an abundant number, since it is smaller than the sum of its proper divisors (94102050).

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

65940990 is a wasteful number, since it uses less digits than its factorization.

65940990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24796.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 65940990 is about 8120.4057780384. The cubic root of 65940990 is about 404.0035249505.

The spelling of 65940990 in words is "sixty-five million, nine hundred forty thousand, nine hundred ninety".