764145621 has 24 divisors (see below), whose sum is σ = 1145235000. Its totient is φ = 490396032.

The previous prime is 764145611. The next prime is 764145709. The reversal of 764145621 is 126541467.

764145621 is a `hidden beast` number, since 7 + 641 + 4 + 5 + 6 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 341843121 + 422302500 = 18489^2 + 20550^2 .

It is not a de Polignac number, because 764145621 - 2⁵ = 764145589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (764145611) 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, 86895 + ... + 95283.

It is an arithmetic number, because the mean of its divisors is an integer number (47718125).

Almost surely, 2^764145621 is an apocalyptic number.

It is an amenable number.

764145621 is a deficient number, since it is larger than the sum of its proper divisors (381089379).

764145621 is a wasteful number, since it uses less digits than its factorization.

764145621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8773 (or 8770 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 764145621 is about 27643.1839881009. The cubic root of 764145621 is about 914.2368230959.

The spelling of 764145621 in words is "seven hundred sixty-four million, one hundred forty-five thousand, six hundred twenty-one".