867666780 has 72 divisors (see below), whose sum is σ = 2648772672. Its totient is φ = 229896576.

The previous prime is 867666769. The next prime is 867666797. The reversal of 867666780 is 87666768.

It is a super-2 number, since 2×867666780² = 1505691282231136800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12909 + ... + 43611.

Almost surely, 2^867666780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 867666780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1324386336).

867666780 is an abundant number, since it is smaller than the sum of its proper divisors (1781105892).

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

867666780 is a wasteful number, since it uses less digits than its factorization.

867666780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30875 (or 30870 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The square root of 867666780 is about 29456.1840705819. The cubic root of 867666780 is about 953.7861023822.

The spelling of 867666780 in words is "eight hundred sixty-seven million, six hundred sixty-six thousand, seven hundred eighty".