65428515 has 24 divisors (see below), whose sum is σ = 115107408. Its totient is φ = 34372800.

The previous prime is 65428501. The next prime is 65428523. The reversal of 65428515 is 51582456.

It is not a de Polignac number, because 65428515 - 2⁹ = 65428003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65428515.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7836 + ... + 13865.

It is an arithmetic number, because the mean of its divisors is an integer number (4796142).

Almost surely, 2^65428515 is an apocalyptic number.

65428515 is a deficient number, since it is larger than the sum of its proper divisors (49678893).

65428515 is a wasteful number, since it uses less digits than its factorization.

65428515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21779 (or 21776 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 65428515 is about 8088.7894644378. The cubic root of 65428515 is about 402.9542009457.

The spelling of 65428515 in words is "sixty-five million, four hundred twenty-eight thousand, five hundred fifteen".