65947920 has 40 divisors (see below), whose sum is σ = 204439296. Its totient is φ = 17586048.

The previous prime is 65947873. The next prime is 65947927. The reversal of 65947920 is 2974956.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (65947927) 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, 137152 + ... + 137631.

Almost surely, 2^65947920 is an apocalyptic number.

65947920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65947920 is an abundant number, since it is smaller than the sum of its proper divisors (138491376).

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

65947920 is a wasteful number, since it uses less digits than its factorization.

65947920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274799 (or 274793 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 65947920 is about 8120.8324696425. The cubic root of 65947920 is about 404.0176772319.

The spelling of 65947920 in words is "sixty-five million, nine hundred forty-seven thousand, nine hundred twenty".