28210820787 has 24 divisors (see below), whose sum is σ = 42384595968. Its totient is φ = 18061570800.

The previous prime is 28210820723. The next prime is 28210820797. The reversal of 28210820787 is 78702801282.

It is not a de Polignac number, because 28210820787 - 2⁶ = 28210820723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28210820797) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 349383 + ... + 422480.

It is an arithmetic number, because the mean of its divisors is an integer number (1766024832).

Almost surely, 2^28210820787 is an apocalyptic number.

28210820787 is a deficient number, since it is larger than the sum of its proper divisors (14173775181).

28210820787 is a wasteful number, since it uses less digits than its factorization.

28210820787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772031 (or 772028 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 45.

The spelling of 28210820787 in words is "twenty-eight billion, two hundred ten million, eight hundred twenty thousand, seven hundred eighty-seven".