1620021276 has 48 divisors (see below), whose sum is σ = 4202261280. Its totient is φ = 539723520.

The previous prime is 1620021191. The next prime is 1620021289. The reversal of 1620021276 is 6721200261.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 345540 + ... + 350196.

It is an arithmetic number, because the mean of its divisors is an integer number (87547110).

Almost surely, 2^1620021276 is an apocalyptic number.

It is an amenable number.

1620021276 is an abundant number, since it is smaller than the sum of its proper divisors (2582240004).

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

1620021276 is a wasteful number, since it uses less digits than its factorization.

1620021276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7891 (or 7883 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1620021276 is about 40249.4878973634. The cubic root of 1620021276 is about 1174.4654338543.

The spelling of 1620021276 in words is "one billion, six hundred twenty million, twenty-one thousand, two hundred seventy-six".