65723990 has 16 divisors (see below), whose sum is σ = 119970720. Its totient is φ = 25919040.

The previous prime is 65723981. The next prime is 65724013. The reversal of 65723990 is 9932756.

65723990 = T₁₃₂₅ + T₁₃₂₆ + ... + T₁₃₉₅.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45575 + ... + 46994.

It is an arithmetic number, because the mean of its divisors is an integer number (7498170).

Almost surely, 2^65723990 is an apocalyptic number.

65723990 is a deficient number, since it is larger than the sum of its proper divisors (54246730).

65723990 is a wasteful number, since it uses less digits than its factorization.

65723990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92647.

The product of its (nonzero) digits is 102060, while the sum is 41.

The square root of 65723990 is about 8107.0333661581. The cubic root of 65723990 is about 403.5598701589.

The spelling of 65723990 in words is "sixty-five million, seven hundred twenty-three thousand, nine hundred ninety".