821253628 has 48 divisors (see below), whose sum is σ = 1602571264. Its totient is φ = 365783040.

The previous prime is 821253619. The next prime is 821253647. The reversal of 821253628 is 826352128.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242668 + ... + 246028.

Almost surely, 2^821253628 is an apocalyptic number.

It is an amenable number.

821253628 is a deficient number, since it is larger than the sum of its proper divisors (781317636).

821253628 is a wasteful number, since it uses less digits than its factorization.

821253628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3542 (or 3540 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 821253628 is about 28657.5230611440. The cubic root of 821253628 is about 936.4669045989.

The spelling of 821253628 in words is "eight hundred twenty-one million, two hundred fifty-three thousand, six hundred twenty-eight".