28439157456 has 240 divisors, whose sum is σ = 85808228160. Its totient is φ = 9015494400.

The previous prime is 28439157419. The next prime is 28439157463. The reversal of 28439157456 is 65475193482.

It is a happy number.

28439157456 is a `hidden beast` number, since 2 + 8 + 4 + 39 + 157 + 456 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25323711 + ... + 25324833.

It is an arithmetic number, because the mean of its divisors is an integer number (357534284).

Almost surely, 2^28439157456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28439157456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42904114080).

28439157456 is an abundant number, since it is smaller than the sum of its proper divisors (57369070704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28439157456 is a wasteful number, since it uses less digits than its factorization.

28439157456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263 (or 1220 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The spelling of 28439157456 in words is "twenty-eight billion, four hundred thirty-nine million, one hundred fifty-seven thousand, four hundred fifty-six".