64249904540 has 12 divisors (see below), whose sum is σ = 134924799576. Its totient is φ = 25699961808.

The previous prime is 64249904519. The next prime is 64249904573. The reversal of 64249904540 is 4540994246.

It is a happy number.

It is a super-2 number, since 2×64249904540² (a number of 22 digits) contains 22 as substring.

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, 1606247594 + ... + 1606247633.

It is an arithmetic number, because the mean of its divisors is an integer number (11243733298).

Almost surely, 2^64249904540 is an apocalyptic number.

It is an amenable number.

64249904540 is an abundant number, since it is smaller than the sum of its proper divisors (70674895036).

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

64249904540 is a wasteful number, since it uses less digits than its factorization.

64249904540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3212495236 (or 3212495234 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 64249904540 in words is "sixty-four billion, two hundred forty-nine million, nine hundred four thousand, five hundred forty".