1620421804 has 24 divisors (see below), whose sum is σ = 2905943040. Its totient is φ = 790207824.

The previous prime is 1620421769. The next prime is 1620421819. The reversal of 1620421804 is 4081240261.

It is a super-2 number, since 2×1620421804² = 5251533645757228832, which contains 22 as substring.

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, 117117 + ... + 130219.

It is an arithmetic number, because the mean of its divisors is an integer number (121080960).

Almost surely, 2^1620421804 is an apocalyptic number.

It is an amenable number.

1620421804 is a deficient number, since it is larger than the sum of its proper divisors (1285521236).

1620421804 is a wasteful number, since it uses less digits than its factorization.

1620421804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13869 (or 13867 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 1620421804 is about 40254.4631562762. The cubic root of 1620421804 is about 1174.5622160255.

The spelling of 1620421804 in words is "one billion, six hundred twenty million, four hundred twenty-one thousand, eight hundred four".