28409089736776 has 64 divisors (see below), whose sum is σ = 65037081369600. Its totient is φ = 11362360629312.

The previous prime is 28409089736771. The next prime is 28409089736791. The reversal of 28409089736776 is 67763798090482.

It is a Harshad number since it is a multiple of its sum of digits (76).

It is not an unprimeable number, because it can be changed into a prime (28409089736771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199184476 + ... + 199327051.

It is an arithmetic number, because the mean of its divisors is an integer number (1016204396400).

Almost surely, 2^{28409089736776} is an apocalyptic number.

It is an amenable number.

28409089736776 is an abundant number, since it is smaller than the sum of its proper divisors (36627991632824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28409089736776 is a wasteful number, since it uses less digits than its factorization.

28409089736776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398511626 (or 398511622 counting only the distinct ones).

The product of its (nonzero) digits is 1536288768, while the sum is 76.

The spelling of 28409089736776 in words is "twenty-eight trillion, four hundred nine billion, eighty-nine million, seven hundred thirty-six thousand, seven hundred seventy-six".