28940311060509 has 4 divisors (see below), whose sum is σ = 38587081414016. Its totient is φ = 19293540707004.

The previous prime is 28940311060487. The next prime is 28940311060543. The reversal of 28940311060509 is 90506011304982.

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 not a de Polignac number, because 28940311060509 - 2²³ = 28940302671901 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 (28940301060509) 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, 4823385176749 + ... + 4823385176754.

It is an arithmetic number, because the mean of its divisors is an integer number (9646770353504).

Almost surely, 2^{28940311060509} is an apocalyptic number.

It is an amenable number.

28940311060509 is a deficient number, since it is larger than the sum of its proper divisors (9646770353507).

28940311060509 is an equidigital number, since it uses as much as digits as its factorization.

28940311060509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9646770353506.

The product of its (nonzero) digits is 466560, while the sum is 48.

The spelling of 28940311060509 in words is "twenty-eight trillion, nine hundred forty billion, three hundred eleven million, sixty thousand, five hundred nine".