3447705621 has 32 divisors (see below), whose sum is σ = 5120938368. Its totient is φ = 2053416960.

The previous prime is 3447705601. The next prime is 3447705637. The reversal of 3447705621 is 1265077443.

It is not a de Polignac number, because 3447705621 - 2¹⁰ = 3447704597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3447705621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3447705601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55086 + ... + 99648.

It is an arithmetic number, because the mean of its divisors is an integer number (160029324).

Almost surely, 2^3447705621 is an apocalyptic number.

It is an amenable number.

3447705621 is a deficient number, since it is larger than the sum of its proper divisors (1673232747).

3447705621 is a wasteful number, since it uses less digits than its factorization.

3447705621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44661.

The product of its (nonzero) digits is 141120, while the sum is 39.

The square root of 3447705621 is about 58717.1663229758. The cubic root of 3447705621 is about 1510.6947698216.

The spelling of 3447705621 in words is "three billion, four hundred forty-seven million, seven hundred five thousand, six hundred twenty-one".