1620872106 has 96 divisors (see below), whose sum is σ = 4032830592. Its totient is φ = 425103360.

The previous prime is 1620872101. The next prime is 1620872111. The reversal of 1620872106 is 6012780261.

It is an interprime number because it is at equal distance from previous prime (1620872101) and next prime (1620872111).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1620872101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 496030 + ... + 499286.

It is an arithmetic number, because the mean of its divisors is an integer number (42008652).

Almost surely, 2^1620872106 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620872106, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2016415296).

1620872106 is an abundant number, since it is smaller than the sum of its proper divisors (2411958486).

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

1620872106 is a wasteful number, since it uses less digits than its factorization.

1620872106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3344 (or 3327 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 1620872106 is about 40260.0559612130. The cubic root of 1620872106 is about 1174.6710063681.

The spelling of 1620872106 in words is "one billion, six hundred twenty million, eight hundred seventy-two thousand, one hundred six".