28904715157 has 4 divisors (see below), whose sum is σ = 29169896140. Its totient is φ = 28639534176.

The previous prime is 28904715139. The next prime is 28904715233. The reversal of 28904715157 is 75151740982.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7491075601 + 21413639556 = 86551^2 + 146334^2 .

It is a cyclic number.

It is not a de Polignac number, because 28904715157 - 2¹⁹ = 28904190869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28904715157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28904715757) 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, 132590328 + ... + 132590545.

It is an arithmetic number, because the mean of its divisors is an integer number (7292474035).

Almost surely, 2^28904715157 is an apocalyptic number.

It is an amenable number.

28904715157 is a deficient number, since it is larger than the sum of its proper divisors (265180983).

28904715157 is a wasteful number, since it uses less digits than its factorization.

28904715157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265180982.

The product of its (nonzero) digits is 705600, while the sum is 49.

The spelling of 28904715157 in words is "twenty-eight billion, nine hundred four million, seven hundred fifteen thousand, one hundred fifty-seven".