28773432157 has 8 divisors (see below), whose sum is σ = 28840414392. Its totient is φ = 28706496000.

The previous prime is 28773432143. The next prime is 28773432187. The reversal of 28773432157 is 75123437782.

It can be written as a sum of positive squares in 4 ways, for example, as 13003236 + 28760428921 = 3606^2 + 169589^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28773432157 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 28773432157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28773432187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1449463 + ... + 1469179.

It is an arithmetic number, because the mean of its divisors is an integer number (3605051799).

Almost surely, 2^28773432157 is an apocalyptic number.

It is an amenable number.

28773432157 is a deficient number, since it is larger than the sum of its proper divisors (66982235).

28773432157 is a wasteful number, since it uses less digits than its factorization.

28773432157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23039.

The product of its digits is 1975680, while the sum is 49.

The spelling of 28773432157 in words is "twenty-eight billion, seven hundred seventy-three million, four hundred thirty-two thousand, one hundred fifty-seven".