65978415 has 16 divisors (see below), whose sum is σ = 117295200. Its totient is φ = 35188416.

The previous prime is 65978413. The next prime is 65978441. The reversal of 65978415 is 51487956.

It is not a de Polignac number, because 65978415 - 2¹ = 65978413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65978413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244230 + ... + 244499.

It is an arithmetic number, because the mean of its divisors is an integer number (7330950).

Almost surely, 2^65978415 is an apocalyptic number.

65978415 is a deficient number, since it is larger than the sum of its proper divisors (51316785).

65978415 is a wasteful number, since it uses less digits than its factorization.

65978415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488743 (or 488737 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 65978415 is about 8122.7098310847. The cubic root of 65978415 is about 404.0799416193.

The spelling of 65978415 in words is "sixty-five million, nine hundred seventy-eight thousand, four hundred fifteen".