1987672806 has 48 divisors (see below), whose sum is σ = 4940103168. Its totient is φ = 565801200.

The previous prime is 1987672801. The next prime is 1987672823. The reversal of 1987672806 is 6082767891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987672801) 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, 5041 + ... + 63251.

It is an arithmetic number, because the mean of its divisors is an integer number (102918816).

Almost surely, 2^1987672806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1987672806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2470051584).

1987672806 is an abundant number, since it is smaller than the sum of its proper divisors (2952430362).

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

1987672806 is a wasteful number, since it uses less digits than its factorization.

1987672806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58497 (or 58494 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The square root of 1987672806 is about 44583.3243040489. The cubic root of 1987672806 is about 1257.3271648177.

The spelling of 1987672806 in words is "one billion, nine hundred eighty-seven million, six hundred seventy-two thousand, eight hundred six".