1890728434917 has 160 divisors (see below), whose sum is σ = 3500652494592. Its totient is φ = 992254427136.

The previous prime is 1890728434909. The next prime is 1890728434943. The reversal of 1890728434917 is 7194348270981.

1890728434917 is a `hidden beast` number, since 1 + 8 + 9 + 0 + 7 + 284 + 349 + 1 + 7 = 666.

It is not a de Polignac number, because 1890728434917 - 2³ = 1890728434909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890728434957) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 686787013 + ... + 686789765.

Almost surely, 2^{1890728434917} is an apocalyptic number.

1890728434917 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1890728434917 is a deficient number, since it is larger than the sum of its proper divisors (1609924059675).

1890728434917 is a wasteful number, since it uses less digits than its factorization.

1890728434917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4489 (or 4480 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 63.

The spelling of 1890728434917 in words is "one trillion, eight hundred ninety billion, seven hundred twenty-eight million, four hundred thirty-four thousand, nine hundred seventeen".