3638528890 has 16 divisors (see below), whose sum is σ = 6563691432. Its totient is φ = 1452225024.

The previous prime is 3638528857. The next prime is 3638528897. The reversal of 3638528890 is 988258363.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3354842241 + 283686649 = 57921^2 + 16843^2 .

It is not an unprimeable number, because it can be changed into a prime (3638528897) 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, 393519 + ... + 402658.

Almost surely, 2^3638528890 is an apocalyptic number.

3638528890 is a deficient number, since it is larger than the sum of its proper divisors (2925162542).

3638528890 is a wasteful number, since it uses less digits than its factorization.

3638528890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796641.

The product of its (nonzero) digits is 2488320, while the sum is 52.

The square root of 3638528890 is about 60320.2195785128. The cubic root of 3638528890 is about 1538.0670765179.

The spelling of 3638528890 in words is "three billion, six hundred thirty-eight million, five hundred twenty-eight thousand, eight hundred ninety".