866719440 has 200 divisors, whose sum is σ = 3062616480. Its totient is φ = 227107584.

The previous prime is 866719423. The next prime is 866719453. The reversal of 866719440 is 44917668.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 381187 + ... + 383453.

Almost surely, 2^866719440 is an apocalyptic number.

866719440 is a gapful number since it is divisible by the number (80) 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 866719440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1531308240).

866719440 is an abundant number, since it is smaller than the sum of its proper divisors (2195897040).

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

866719440 is a wasteful number, since it uses less digits than its factorization.

866719440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2351 (or 2336 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 866719440 is about 29440.0991846155. The cubic root of 866719440 is about 953.4388535729.

The spelling of 866719440 in words is "eight hundred sixty-six million, seven hundred nineteen thousand, four hundred forty".