964785721 has 9 divisors (see below), whose sum is σ = 978551661. Its totient is φ = 951212064.

The previous prime is 964785713. The next prime is 964785727. The reversal of 964785721 is 127587469.

The square root of 964785721 is 31061.

It is a perfect power (a square), and thus also a powerful number.

964785721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 7502121 + 957283600 = 2739^2 + 30940^2 .

It is not a de Polignac number, because 964785721 - 2³ = 964785713 is a prime.

It is a super-2 number, since 2×964785721² = 1861622974890979682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (964785727) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2764255 + ... + 2764603.

Almost surely, 2^964785721 is an apocalyptic number.

964785721 is the 31061-st square number.

964785721 is the 15531-st centered octagonal number.

It is an amenable number.

964785721 is a deficient number, since it is larger than the sum of its proper divisors (13765940).

964785721 is an frugal number, since it uses more digits than its factorization.

964785721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876 (or 438 counting only the distinct ones).

The product of its digits is 846720, while the sum is 49.

The cubic root of 964785721 is about 988.1213636994.

Multiplying 964785721 by its sum of digits (49), we get a square (47274500329 = 217427²).

The spelling of 964785721 in words is "nine hundred sixty-four million, seven hundred eighty-five thousand, seven hundred twenty-one".