3572121816 has 128 divisors (see below), whose sum is σ = 10279526400. Its totient is φ = 1148152320.

The previous prime is 3572121803. The next prime is 3572121829. The reversal of 3572121816 is 6181212753.

3572121816 is a `hidden beast` number, since 3 + 572 + 1 + 2 + 1 + 81 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (3572121803) and next prime (3572121829).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2255761 + ... + 2257343.

It is an arithmetic number, because the mean of its divisors is an integer number (80308800).

Almost surely, 2^3572121816 is an apocalyptic number.

3572121816 is a gapful number since it is divisible by the number (36) 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 3572121816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5139763200).

3572121816 is an abundant number, since it is smaller than the sum of its proper divisors (6707404584).

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

3572121816 is a wasteful number, since it uses less digits than its factorization.

3572121816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966 (or 1956 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 3572121816 is about 59767.2302855001. The cubic root of 3572121816 is about 1528.6524390009.

The spelling of 3572121816 in words is "three billion, five hundred seventy-two million, one hundred twenty-one thousand, eight hundred sixteen".