65978540 has 24 divisors (see below), whose sum is σ = 143025792. Its totient is φ = 25539840.

The previous prime is 65978537. The next prime is 65978551. The reversal of 65978540 is 4587956.

It is a junction number, because it is equal to n+sod(n) for n = 65978491 and 65978500.

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, 52589 + ... + 53828.

It is an arithmetic number, because the mean of its divisors is an integer number (5959408).

Almost surely, 2^65978540 is an apocalyptic number.

It is an amenable number.

65978540 is an abundant number, since it is smaller than the sum of its proper divisors (77047252).

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

65978540 is a wasteful number, since it uses less digits than its factorization.

65978540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106457 (or 106455 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 65978540 is about 8122.7175255576. The cubic root of 65978540 is about 404.0801968036.

The spelling of 65978540 in words is "sixty-five million, nine hundred seventy-eight thousand, five hundred forty".