28956457487 has 4 divisors (see below), whose sum is σ = 29129849616. Its totient is φ = 28783065360.

The previous prime is 28956457447. The next prime is 28956457489. The reversal of 28956457487 is 78475465982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28956457487 - 2¹⁴ = 28956441103 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 (28956457489) 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, 86695814 + ... + 86696147.

It is an arithmetic number, because the mean of its divisors is an integer number (7282462404).

Almost surely, 2^28956457487 is an apocalyptic number.

28956457487 is a deficient number, since it is larger than the sum of its proper divisors (173392129).

28956457487 is a wasteful number, since it uses less digits than its factorization.

28956457487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173392128.

The product of its digits is 135475200, while the sum is 65.

The spelling of 28956457487 in words is "twenty-eight billion, nine hundred fifty-six million, four hundred fifty-seven thousand, four hundred eighty-seven".