64096821 has 12 divisors (see below), whose sum is σ = 93625740. Its totient is φ = 42250560.

The previous prime is 64096807. The next prime is 64096849. The reversal of 64096821 is 12869046.

64096821 is a `hidden beast` number, since 640 + 9 + 6 + 8 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5574321 + 58522500 = 2361^2 + 7650^2 .

It is not a de Polignac number, because 64096821 - 2⁹ = 64096309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64096891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39210 + ... + 40811.

It is an arithmetic number, because the mean of its divisors is an integer number (7802145).

Almost surely, 2^64096821 is an apocalyptic number.

It is an amenable number.

64096821 is a deficient number, since it is larger than the sum of its proper divisors (29528919).

64096821 is a wasteful number, since it uses less digits than its factorization.

64096821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80116 (or 80113 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 64096821 is about 8006.0490255806. The cubic root of 64096821 is about 400.2016087843.

It can be divided in two parts, 640 and 96821, that added together give a triangular number (97461 = T₄₄₁).

The spelling of 64096821 in words is "sixty-four million, ninety-six thousand, eight hundred twenty-one".