64749320692 has 36 divisors (see below), whose sum is σ = 131838753060. Its totient is φ = 27743890944.

The previous prime is 64749320663. The next prime is 64749320693. The reversal of 64749320692 is 29602394746.

It can be written as a sum of positive squares in 2 ways, for example, as 56470868496 + 8278452196 = 237636^2 + 90986^2 .

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64749320693) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 977934 + ... + 1042042.

It is an arithmetic number, because the mean of its divisors is an integer number (3662187585).

Almost surely, 2^64749320692 is an apocalyptic number.

It is an amenable number.

64749320692 is an abundant number, since it is smaller than the sum of its proper divisors (67089432368).

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

64749320692 is a wasteful number, since it uses less digits than its factorization.

64749320692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69280 (or 69271 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 52.

The spelling of 64749320692 in words is "sixty-four billion, seven hundred forty-nine million, three hundred twenty thousand, six hundred ninety-two".