764731890 has 48 divisors (see below), whose sum is σ = 2141252568. Its totient is φ = 188241408.

The previous prime is 764731883. The next prime is 764731951. The reversal of 764731890 is 98137467.

It can be written as a sum of positive squares in 4 ways, for example, as 349428249 + 415303641 = 18693^2 + 20379^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 325639 + ... + 327978.

Almost surely, 2^764731890 is an apocalyptic number.

764731890 is an abundant number, since it is smaller than the sum of its proper divisors (1376520678).

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

764731890 is a wasteful number, since it uses less digits than its factorization.

764731890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653643 (or 653640 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 764731890 is about 27653.7861783879. The cubic root of 764731890 is about 914.4705707298.

The spelling of 764731890 in words is "seven hundred sixty-four million, seven hundred thirty-one thousand, eight hundred ninety".