1621240828 has 12 divisors (see below), whose sum is σ = 2839847920. Its totient is φ = 809855712.

The previous prime is 1621240807. The next prime is 1621240837. The reversal of 1621240828 is 8280421261.

It is a junction number, because it is equal to n+sod(n) for n = 1621240793 and 1621240802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186393 + ... + 194896.

Almost surely, 2^1621240828 is an apocalyptic number.

It is an amenable number.

1621240828 is a deficient number, since it is larger than the sum of its proper divisors (1218607092).

1621240828 is a wasteful number, since it uses less digits than its factorization.

1621240828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382356 (or 382354 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 1621240828 is about 40264.6349542623. The cubic root of 1621240828 is about 1174.7600724542.

The spelling of 1621240828 in words is "one billion, six hundred twenty-one million, two hundred forty thousand, eight hundred twenty-eight".