3581021428 has 24 divisors (see below), whose sum is σ = 6613125120. Its totient is φ = 1692028800.

The previous prime is 3581021417. The next prime is 3581021429. The reversal of 3581021428 is 8241201853.

It is a happy number.

3581021428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 3581021393 and 3581021402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3581021429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28276 + ... + 89227.

It is an arithmetic number, because the mean of its divisors is an integer number (275546880).

Almost surely, 2^3581021428 is an apocalyptic number.

3581021428 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

3581021428 is a deficient number, since it is larger than the sum of its proper divisors (3032103692).

3581021428 is a wasteful number, since it uses less digits than its factorization.

3581021428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117927 (or 117925 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 3581021428 is about 59841.6362409986. The cubic root of 3581021428 is about 1529.9208850258.

The spelling of 3581021428 in words is "three billion, five hundred eighty-one million, twenty-one thousand, four hundred twenty-eight".