1187787321870 has 64 divisors (see below), whose sum is σ = 2855835035136. Its totient is φ = 316171831680.

The previous prime is 1187787321827. The next prime is 1187787321907. The reversal of 1187787321870 is 781237877811.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129285417 + ... + 129294603.

It is an arithmetic number, because the mean of its divisors is an integer number (44622422424).

Almost surely, 2^{1187787321870} is an apocalyptic number.

1187787321870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1187787321870 is an abundant number, since it is smaller than the sum of its proper divisors (1668047713266).

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

1187787321870 is a wasteful number, since it uses less digits than its factorization.

1187787321870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16505.

The product of its (nonzero) digits is 7375872, while the sum is 60.

The spelling of 1187787321870 in words is "one trillion, one hundred eighty-seven billion, seven hundred eighty-seven million, three hundred twenty-one thousand, eight hundred seventy".