64428237515 has 32 divisors (see below), whose sum is σ = 81542495232. Its totient is φ = 48820464000.

The previous prime is 64428237493. The next prime is 64428237541. The reversal of 64428237515 is 51573282446.

It is not a de Polignac number, because 64428237515 - 2⁸ = 64428237259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64428237515.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 896570 + ... + 965760.

It is an arithmetic number, because the mean of its divisors is an integer number (2548202976).

Almost surely, 2^64428237515 is an apocalyptic number.

64428237515 is a deficient number, since it is larger than the sum of its proper divisors (17114257717).

64428237515 is a wasteful number, since it uses less digits than its factorization.

64428237515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69371.

The product of its digits is 1612800, while the sum is 47.

The spelling of 64428237515 in words is "sixty-four billion, four hundred twenty-eight million, two hundred thirty-seven thousand, five hundred fifteen".