64880640000 has 630 divisors, whose sum is σ = 255508489236. Its totient is φ = 15728640000.

The previous prime is 64880639977. The next prime is 64880640023. The reversal of 64880640000 is 4608846.

64880640000 is a `hidden beast` number, since 6 + 4 + 8 + 8 + 0 + 640 + 0 + 0 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (64880639977) and next prime (64880640023).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 5898239995 + ... + 5898240005.

Almost surely, 2^64880640000 is an apocalyptic number.

64880640000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64880640000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127754244618).

64880640000 is an abundant number, since it is smaller than the sum of its proper divisors (190627849236).

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

64880640000 is an frugal number, since it uses more digits than its factorization.

64880640000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 21 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The spelling of 64880640000 in words is "sixty-four billion, eight hundred eighty million, six hundred forty thousand".