1157287860 has 72 divisors (see below), whose sum is σ = 3576704040. Its totient is φ = 302784768.

The previous prime is 1157287823. The next prime is 1157287867. The reversal of 1157287860 is 687827511.

It is a happy number.

1157287860 is a `hidden beast` number, since 1 + 1 + 572 + 8 + 78 + 6 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 529184016 + 628103844 = 23004^2 + 25062^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157287867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51115 + ... + 70194.

It is an arithmetic number, because the mean of its divisors is an integer number (49676445).

Almost surely, 2^1157287860 is an apocalyptic number.

1157287860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1157287860 is an abundant number, since it is smaller than the sum of its proper divisors (2419416180).

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

1157287860 is a wasteful number, since it uses less digits than its factorization.

1157287860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121377 (or 121372 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The square root of 1157287860 is about 34018.9338457277. The cubic root of 1157287860 is about 1049.8980581303.

The spelling of 1157287860 in words is "one billion, one hundred fifty-seven million, two hundred eighty-seven thousand, eight hundred sixty".