1187778880 has 112 divisors (see below), whose sum is σ = 2994257664. Its totient is φ = 447856640.

The previous prime is 1187778869. The next prime is 1187778883. The reversal of 1187778880 is 888777811.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187778883) 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, 521424 + ... + 523696.

Almost surely, 2^1187778880 is an apocalyptic number.

1187778880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1187778880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1497128832).

1187778880 is an abundant number, since it is smaller than the sum of its proper divisors (1806478784).

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

1187778880 is a wasteful number, since it uses less digits than its factorization.

1187778880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384 (or 2374 counting only the distinct ones).

The product of its (nonzero) digits is 1404928, while the sum is 55.

The square root of 1187778880 is about 34464.1680590146. The cubic root of 1187778880 is about 1059.0387868721.

The spelling of 1187778880 in words is "one billion, one hundred eighty-seven million, seven hundred seventy-eight thousand, eight hundred eighty".