764520981 has 24 divisors (see below), whose sum is σ = 1186833024. Its totient is φ = 436484160.

The previous prime is 764520959. The next prime is 764521007. The reversal of 764520981 is 189025467.

It is not a de Polignac number, because 764520981 - 2¹⁰ = 764519957 is a prime.

It is a super-2 number, since 2×764520981² = 1168984660778404722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (764520901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 302001 + ... + 304521.

It is an arithmetic number, because the mean of its divisors is an integer number (49451376).

Almost surely, 2^764520981 is an apocalyptic number.

It is an amenable number.

764520981 is a deficient number, since it is larger than the sum of its proper divisors (422312043).

764520981 is a wasteful number, since it uses less digits than its factorization.

764520981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4601 (or 4594 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 764520981 is about 27649.9725316319. The cubic root of 764520981 is about 914.3864942886.

The spelling of 764520981 in words is "seven hundred sixty-four million, five hundred twenty thousand, nine hundred eighty-one".