28875774901861 has 4 divisors (see below), whose sum is σ = 28884443705824. Its totient is φ = 28867106097900.

The previous prime is 28875774901823. The next prime is 28875774901871. The reversal of 28875774901861 is 16810947757882.

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 not a de Polignac number, because 28875774901861 - 2²¹ = 28875772804709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28875774901811) 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, 4334396985 + ... + 4334403646.

It is an arithmetic number, because the mean of its divisors is an integer number (7221110926456).

Almost surely, 2^{28875774901861} is an apocalyptic number.

It is an amenable number.

28875774901861 is a deficient number, since it is larger than the sum of its proper divisors (8668803963).

28875774901861 is an equidigital number, since it uses as much as digits as its factorization.

28875774901861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8668803962.

The product of its (nonzero) digits is 379330560, while the sum is 73.

The spelling of 28875774901861 in words is "twenty-eight trillion, eight hundred seventy-five billion, seven hundred seventy-four million, nine hundred one thousand, eight hundred sixty-one".