28925777623 has 4 divisors (see below), whose sum is σ = 28938803608. Its totient is φ = 28912751640.

The previous prime is 28925777599. The next prime is 28925777633. The reversal of 28925777623 is 32677752982.

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 28925777623 - 2¹⁷ = 28925646551 is a prime.

It is a super-2 number, since 2×28925777623² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28925777633) 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, 6509661 + ... + 6514102.

It is an arithmetic number, because the mean of its divisors is an integer number (7234700902).

Almost surely, 2^28925777623 is an apocalyptic number.

28925777623 is a deficient number, since it is larger than the sum of its proper divisors (13025985).

28925777623 is a wasteful number, since it uses less digits than its factorization.

28925777623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13025984.

The product of its digits is 17781120, while the sum is 58.

The spelling of 28925777623 in words is "twenty-eight billion, nine hundred twenty-five million, seven hundred seventy-seven thousand, six hundred twenty-three".