764400490 has 36 divisors (see below), whose sum is σ = 1601843526. Its totient is φ = 261870336.

The previous prime is 764400479. The next prime is 764400491. The reversal of 764400490 is 94004467.

It can be written as a sum of positive squares in 3 ways, for example, as 552203001 + 212197489 = 23499^2 + 14567^2 .

It is a super-2 number, since 2×764400490² = 1168616218224480200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (764400491) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 611386 + ... + 612634.

Almost surely, 2^764400490 is an apocalyptic number.

764400490 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

764400490 is an abundant number, since it is smaller than the sum of its proper divisors (837443036).

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

764400490 is an equidigital number, since it uses as much as digits as its factorization.

764400490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2519 (or 1263 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 764400490 is about 27647.7935828521. The cubic root of 764400490 is about 914.3384550003.

The spelling of 764400490 in words is "seven hundred sixty-four million, four hundred thousand, four hundred ninety".