866644906428 has 144 divisors (see below), whose sum is σ = 2678615779840. Its totient is φ = 230734915200.

The previous prime is 866644906423. The next prime is 866644906441. The reversal of 866644906428 is 824609446668.

866644906428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866644906423) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1191568 + ... + 1775703.

Almost surely, 2^866644906428 is an apocalyptic number.

It is an amenable number.

866644906428 is an abundant number, since it is smaller than the sum of its proper divisors (1811970873412).

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

866644906428 is a wasteful number, since it uses less digits than its factorization.

866644906428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2967368 (or 2967363 counting only the distinct ones).

The product of its (nonzero) digits is 95551488, while the sum is 63.

The spelling of 866644906428 in words is "eight hundred sixty-six billion, six hundred forty-four million, nine hundred six thousand, four hundred twenty-eight".