3556721090 has 16 divisors (see below), whose sum is σ = 6894567288. Its totient is φ = 1313250816.

The previous prime is 3556721033. The next prime is 3556721101. The reversal of 3556721090 is 901276553.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 951537409 + 2605183681 = 30847^2 + 51041^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13679567 + ... + 13679826.

Almost surely, 2^3556721090 is an apocalyptic number.

3556721090 is a deficient number, since it is larger than the sum of its proper divisors (3337846198).

3556721090 is a wasteful number, since it uses less digits than its factorization.

3556721090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27359413.

The product of its (nonzero) digits is 56700, while the sum is 38.

The square root of 3556721090 is about 59638.2519026170. The cubic root of 3556721090 is about 1526.4524140026.

The spelling of 3556721090 in words is "three billion, five hundred fifty-six million, seven hundred twenty-one thousand, ninety".