1620992100 has 144 divisors (see below), whose sum is σ = 5772491648. Its totient is φ = 342005760.

The previous prime is 1620992099. The next prime is 1620992141. The reversal of 1620992100 is 12990261.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2389 + ... + 56988.

Almost surely, 2^1620992100 is an apocalyptic number.

1620992100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620992100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2886245824).

1620992100 is an abundant number, since it is smaller than the sum of its proper divisors (4151499548).

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

1620992100 is a wasteful number, since it uses less digits than its factorization.

1620992100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59414 (or 59407 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1620992100 is about 40261.5461700119. The cubic root of 1620992100 is about 1174.6999928201.

The spelling of 1620992100 in words is "one billion, six hundred twenty million, nine hundred ninety-two thousand, one hundred".