65739778 has 16 divisors (see below), whose sum is σ = 109622016. Its totient is φ = 29362320.

The previous prime is 65739763. The next prime is 65739841. The reversal of 65739778 is 87793756.

It is a happy number.

It is a super-2 number, since 2×65739778² = 8643436822978568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39976 + ... + 41587.

It is an arithmetic number, because the mean of its divisors is an integer number (6851376).

Almost surely, 2^65739778 is an apocalyptic number.

65739778 is a deficient number, since it is larger than the sum of its proper divisors (43882238).

65739778 is a wasteful number, since it uses less digits than its factorization.

65739778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81609.

The product of its digits is 2222640, while the sum is 52.

The square root of 65739778 is about 8108.0070300907. The cubic root of 65739778 is about 403.5921815119.

The spelling of 65739778 in words is "sixty-five million, seven hundred thirty-nine thousand, seven hundred seventy-eight".