1620084890 has 16 divisors (see below), whose sum is σ = 2918994408. Its totient is φ = 647402496.

The previous prime is 1620084871. The next prime is 1620084911. The reversal of 1620084890 is 984800261.

It can be written as a sum of positive squares in 4 ways, for example, as 1455193609 + 164891281 = 38147^2 + 12841^2 .

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, 68087 + ... + 88746.

Almost surely, 2^1620084890 is an apocalyptic number.

1620084890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1620084890 is a deficient number, since it is larger than the sum of its proper divisors (1298909518).

1620084890 is a wasteful number, since it uses less digits than its factorization.

1620084890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157873.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 1620084890 is about 40250.2781356850. The cubic root of 1620084890 is about 1174.4808063821.

The spelling of 1620084890 in words is "one billion, six hundred twenty million, eighty-four thousand, eight hundred ninety".