821372460 has 24 divisors (see below), whose sum is σ = 2299843056. Its totient is φ = 219032640.

The previous prime is 821372449. The next prime is 821372471. The reversal of 821372460 is 64273128.

It is an interprime number because it is at equal distance from previous prime (821372449) and next prime (821372471).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6844711 + ... + 6844830.

It is an arithmetic number, because the mean of its divisors is an integer number (95826794).

Almost surely, 2^821372460 is an apocalyptic number.

It is an amenable number.

821372460 is an abundant number, since it is smaller than the sum of its proper divisors (1478470596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821372460 is a wasteful number, since it uses less digits than its factorization.

821372460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13689553 (or 13689551 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 821372460 is about 28659.5962986222. The cubic root of 821372460 is about 936.5120700486.

The spelling of 821372460 in words is "eight hundred twenty-one million, three hundred seventy-two thousand, four hundred sixty".