3521405808 has 60 divisors (see below), whose sum is σ = 9973814760. Its totient is φ = 1159655808.

The previous prime is 3521405759. The next prime is 3521405809. The reversal of 3521405808 is 8085041253.

It is a happy number.

3521405808 is a `hidden beast` number, since 35 + 2 + 1 + 40 + 580 + 8 = 666.

It is a super-2 number, since 2×3521405808² = 24800597729232265728, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3521405809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135363 + ... + 159266.

It is an arithmetic number, because the mean of its divisors is an integer number (166230246).

Almost surely, 2^3521405808 is an apocalyptic number.

It is an amenable number.

3521405808 is an abundant number, since it is smaller than the sum of its proper divisors (6452408952).

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

3521405808 is a wasteful number, since it uses less digits than its factorization.

3521405808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294726 (or 294717 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 3521405808 is about 59341.4341586046. The cubic root of 3521405808 is about 1521.3834657224.

The spelling of 3521405808 in words is "three billion, five hundred twenty-one million, four hundred five thousand, eight hundred eight".