8421620464 has 10 divisors (see below), whose sum is σ = 16316889680. Its totient is φ = 4210810224.

The previous prime is 8421620443. The next prime is 8421620479. The reversal of 8421620464 is 4640261248.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 263175624 + ... + 263175655.

It is an arithmetic number, because the mean of its divisors is an integer number (1631688968).

Almost surely, 2^8421620464 is an apocalyptic number.

It is an amenable number.

8421620464 is a deficient number, since it is larger than the sum of its proper divisors (7895269216).

8421620464 is a wasteful number, since it uses less digits than its factorization.

8421620464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526351287 (or 526351281 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 37.

The square root of 8421620464 is about 91769.3874012462. The cubic root of 8421620464 is about 2034.5352639654.

The spelling of 8421620464 in words is "eight billion, four hundred twenty-one million, six hundred twenty thousand, four hundred sixty-four".