17890935049 has 9 divisors (see below), whose sum is σ = 19374907413. Its totient is φ = 16513104192.

The previous prime is 17890935017. The next prime is 17890935061. The reversal of 17890935049 is 94053909871.

The square root of 17890935049 is 133757.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 60140025 + 17830795024 = 7755^2 + 133532^2 .

It is not a de Polignac number, because 17890935049 - 2⁵ = 17890935017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17890935149) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1733697 + ... + 1743985.

Almost surely, 2^17890935049 is an apocalyptic number.

17890935049 is the 133757-th square number.

17890935049 is the 66879-th centered octagonal number.

It is an amenable number.

17890935049 is a deficient number, since it is larger than the sum of its proper divisors (1483972364).

17890935049 is an frugal number, since it uses more digits than its factorization.

17890935049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20604 (or 10302 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 17890935049 in words is "seventeen billion, eight hundred ninety million, nine hundred thirty-five thousand, forty-nine".