1187632780 has 48 divisors (see below), whose sum is σ = 2525130720. Its totient is φ = 469168128.

The previous prime is 1187632763. The next prime is 1187632783. The reversal of 1187632780 is 872367811.

It is not an unprimeable number, because it can be changed into a prime (1187632783) 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, 561004 + ... + 563116.

It is an arithmetic number, because the mean of its divisors is an integer number (52606890).

Almost surely, 2^1187632780 is an apocalyptic number.

1187632780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1187632780 is an abundant number, since it is smaller than the sum of its proper divisors (1337497940).

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

1187632780 is a wasteful number, since it uses less digits than its factorization.

1187632780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2458 (or 2456 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 1187632780 is about 34462.0484011035. The cubic root of 1187632780 is about 1058.9953635510.

The spelling of 1187632780 in words is "one billion, one hundred eighty-seven million, six hundred thirty-two thousand, seven hundred eighty".