1155887764 has 12 divisors (see below), whose sum is σ = 2036380500. Its totient is φ = 574064768.

The previous prime is 1155887753. The next prime is 1155887861. The reversal of 1155887764 is 4677885511.

It can be written as a sum of positive squares in 2 ways, for example, as 264387600 + 891500164 = 16260^2 + 29858^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 969109 + ... + 970300.

It is an arithmetic number, because the mean of its divisors is an integer number (169698375).

Almost surely, 2^1155887764 is an apocalyptic number.

It is an amenable number.

1155887764 is a deficient number, since it is larger than the sum of its proper divisors (880492736).

1155887764 is a wasteful number, since it uses less digits than its factorization.

1155887764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939562 (or 1939560 counting only the distinct ones).

The product of its digits is 1881600, while the sum is 52.

The square root of 1155887764 is about 33998.3494305238. The cubic root of 1155887764 is about 1049.4744956182.

The spelling of 1155887764 in words is "one billion, one hundred fifty-five million, eight hundred eighty-seven thousand, seven hundred sixty-four".