64634915240 has 32 divisors (see below), whose sum is σ = 166204068480. Its totient is φ = 22160542272.

The previous prime is 64634915171. The next prime is 64634915273. The reversal of 64634915240 is 4251943646.

It is a junction number, because it is equal to n+sod(n) for n = 64634915191 and 64634915200.

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, 115419212 + ... + 115419771.

It is an arithmetic number, because the mean of its divisors is an integer number (5193877140).

Almost surely, 2^64634915240 is an apocalyptic number.

It is an amenable number.

64634915240 is an abundant number, since it is smaller than the sum of its proper divisors (101569153240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64634915240 is a wasteful number, since it uses less digits than its factorization.

64634915240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230839001 (or 230838997 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 64634915240 in words is "sixty-four billion, six hundred thirty-four million, nine hundred fifteen thousand, two hundred forty".