64090501992 has 128 divisors (see below), whose sum is σ = 195933168000. Its totient is φ = 19249413120.

The previous prime is 64090501967. The next prime is 64090501997. The reversal of 64090501992 is 29910509046.

64090501992 is a `hidden beast` number, since 6 + 409 + 0 + 50 + 199 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (64090501997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149134 + ... + 387842.

It is an arithmetic number, because the mean of its divisors is an integer number (1530727875).

Almost surely, 2^64090501992 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 64090501992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97966584000).

64090501992 is an abundant number, since it is smaller than the sum of its proper divisors (131842666008).

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

64090501992 is a wasteful number, since it uses less digits than its factorization.

64090501992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238848 (or 238838 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 64090501992 in words is "sixty-four billion, ninety million, five hundred one thousand, nine hundred ninety-two".