3697521828 has 384 divisors, whose sum is σ = 12924334080. Its totient is φ = 789626880.

The previous prime is 3697521787. The next prime is 3697521833. The reversal of 3697521828 is 8281257963.

3697521828 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3879400 + ... + 3880352.

It is an arithmetic number, because the mean of its divisors is an integer number (33657120).

Almost surely, 2^3697521828 is an apocalyptic number.

3697521828 is a gapful number since it is divisible by the number (38) 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 3697521828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6462167040).

3697521828 is an abundant number, since it is smaller than the sum of its proper divisors (9226812252).

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

3697521828 is a wasteful number, since it uses less digits than its factorization.

3697521828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027 (or 1025 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 51.

The square root of 3697521828 is about 60807.2514425706. The cubic root of 3697521828 is about 1546.3349867404.

It can be divided in two parts, 3697 and 521828, that added together give a palindrome (525525).

The spelling of 3697521828 in words is "three billion, six hundred ninety-seven million, five hundred twenty-one thousand, eight hundred twenty-eight".