64439402496 has 480 divisors, whose sum is σ = 217426083840. Its totient is φ = 16540237824.

The previous prime is 64439402453. The next prime is 64439402539. The reversal of 64439402496 is 69420493446.

It is an interprime number because it is at equal distance from previous prime (64439402453) and next prime (64439402539).

It is a super-5 number, since 5×64439402496⁵ (a number of 55 digits) contains 55555 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

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, 134528785 + ... + 134529263.

It is an arithmetic number, because the mean of its divisors is an integer number (452971008).

Almost surely, 2^64439402496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64439402496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108713041920).

64439402496 is an abundant number, since it is smaller than the sum of its proper divisors (152986681344).

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

64439402496 is a wasteful number, since it uses less digits than its factorization.

64439402496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 51.

The spelling of 64439402496 in words is "sixty-four billion, four hundred thirty-nine million, four hundred two thousand, four hundred ninety-six".