1620098100 has 108 divisors (see below), whose sum is σ = 5196327136. Its totient is φ = 421968960.

The previous prime is 1620098083. The next prime is 1620098101. The reversal of 1620098100 is 18900261.

It is a super-2 number, since 2×1620098100² = 5249435707247220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620098101) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17769 + ... + 59631.

Almost surely, 2^1620098100 is an apocalyptic number.

1620098100 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 1620098100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2598163568).

1620098100 is an abundant number, since it is smaller than the sum of its proper divisors (3576229036).

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

1620098100 is a wasteful number, since it uses less digits than its factorization.

1620098100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41926 (or 41916 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1620098100 is about 40250.4422335954. The cubic root of 1620098100 is about 1174.4839985706.

Adding to 1620098100 its reverse (18900261), we get a palindrome (1638998361).

The spelling of 1620098100 in words is "one billion, six hundred twenty million, ninety-eight thousand, one hundred".