65440415 has 4 divisors (see below), whose sum is σ = 78528504. Its totient is φ = 52352328.

The previous prime is 65440399. The next prime is 65440421. The reversal of 65440415 is 51404456.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65440415 - 2⁴ = 65440399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6544037 + ... + 6544046.

It is an arithmetic number, because the mean of its divisors is an integer number (19632126).

Almost surely, 2^65440415 is an apocalyptic number.

65440415 is a deficient number, since it is larger than the sum of its proper divisors (13088089).

65440415 is a wasteful number, since it uses less digits than its factorization.

65440415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13088088.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 65440415 is about 8089.5250169587. The cubic root of 65440415 is about 402.9786289508.

The spelling of 65440415 in words is "sixty-five million, four hundred forty thousand, four hundred fifteen".