65978645 has 8 divisors (see below), whose sum is σ = 79550880. Its totient is φ = 52531920.

The previous prime is 65978639. The next prime is 65978657. The reversal of 65978645 is 54687956.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65978645 - 2¹⁰ = 65977621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65978593 and 65978602.

It is a congruent number.

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, 30215 + ... + 32324.

It is an arithmetic number, because the mean of its divisors is an integer number (9943860).

Almost surely, 2^65978645 is an apocalyptic number.

It is an amenable number.

65978645 is a deficient number, since it is larger than the sum of its proper divisors (13572235).

65978645 is a wasteful number, since it uses less digits than its factorization.

65978645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62755.

The product of its digits is 1814400, while the sum is 50.

The square root of 65978645 is about 8122.7239889091. The cubic root of 65978645 is about 404.0804111581.

The spelling of 65978645 in words is "sixty-five million, nine hundred seventy-eight thousand, six hundred forty-five".