64690920000 has 1120 divisors, whose sum is σ = 279310592000. Its totient is φ = 14370048000.

The previous prime is 64690919987. The next prime is 64690920017. The reversal of 64690920000 is 2909646.

64690920000 is a `hidden beast` number, since 646 + 9 + 0 + 9 + 2 + 0 + 0 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1120).

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 159 ways as a sum of consecutive naturals, for example, 325079901 + ... + 325080099.

Almost surely, 2^64690920000 is an apocalyptic number.

64690920000 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 64690920000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139655296000).

64690920000 is an abundant number, since it is smaller than the sum of its proper divisors (214619672000).

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

64690920000 is a wasteful number, since it uses less digits than its factorization.

64690920000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The spelling of 64690920000 in words is "sixty-four billion, six hundred ninety million, nine hundred twenty thousand".