1157217828 has 48 divisors (see below), whose sum is σ = 2912406336. Its totient is φ = 355512960.

The previous prime is 1157217823. The next prime is 1157217869. The reversal of 1157217828 is 8287127511.

It is a happy number.

1157217828 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1157217828.

It is not an unprimeable number, because it can be changed into a prime (1157217821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101118 + ... + 111978.

It is an arithmetic number, because the mean of its divisors is an integer number (60675132).

Almost surely, 2^1157217828 is an apocalyptic number.

It is an amenable number.

1157217828 is an abundant number, since it is smaller than the sum of its proper divisors (1755188508).

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

1157217828 is a wasteful number, since it uses less digits than its factorization.

1157217828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11564 (or 11562 counting only the distinct ones).

The product of its digits is 62720, while the sum is 42.

The square root of 1157217828 is about 34017.9045210019. The cubic root of 1157217828 is about 1049.8768798949.

The spelling of 1157217828 in words is "one billion, one hundred fifty-seven million, two hundred seventeen thousand, eight hundred twenty-eight".