65813890 has 16 divisors (see below), whose sum is σ = 118557432. Its totient is φ = 26305024.

The previous prime is 65813887. The next prime is 65813893. The reversal of 65813890 is 9831856.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (65813887) and next prime (65813893).

It can be written as a sum of positive squares in 4 ways, for example, as 56505289 + 9308601 = 7517^2 + 3051^2 .

It is not an unprimeable number, because it can be changed into a prime (65813893) 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, 23442 + ... + 26098.

Almost surely, 2^65813890 is an apocalyptic number.

65813890 is a deficient number, since it is larger than the sum of its proper divisors (52743542).

65813890 is a wasteful number, since it uses less digits than its factorization.

65813890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5141.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 65813890 is about 8112.5760397053. The cubic root of 65813890 is about 403.7437883046.

The spelling of 65813890 in words is "sixty-five million, eight hundred thirteen thousand, eight hundred ninety".