287898193813 has 4 divisors (see below), whose sum is σ = 287900206848. Its totient is φ = 287896180780.

The previous prime is 287898193801. The next prime is 287898193901. The reversal of 287898193813 is 318391898782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-287898193813 is a prime.

It is a super-2 number, since 2×287898193813² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287898191813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 774103 + ... + 1083988.

It is an arithmetic number, because the mean of its divisors is an integer number (71975051712).

Almost surely, 2^287898193813 is an apocalyptic number.

It is an amenable number.

287898193813 is a deficient number, since it is larger than the sum of its proper divisors (2013035).

287898193813 is a wasteful number, since it uses less digits than its factorization.

287898193813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2013034.

The product of its digits is 41803776, while the sum is 67.

The spelling of 287898193813 in words is "two hundred eighty-seven billion, eight hundred ninety-eight million, one hundred ninety-three thousand, eight hundred thirteen".