826455780 has 144 divisors (see below), whose sum is σ = 2646483840. Its totient is φ = 208344576.

The previous prime is 826455761. The next prime is 826455797. The reversal of 826455780 is 87554628.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 367339 + ... + 369581.

It is an arithmetic number, because the mean of its divisors is an integer number (18378360).

Almost surely, 2^826455780 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 826455780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1323241920).

826455780 is an abundant number, since it is smaller than the sum of its proper divisors (1820028060).

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

826455780 is a wasteful number, since it uses less digits than its factorization.

826455780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2370 (or 2365 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The square root of 826455780 is about 28748.1439400877. The cubic root of 826455780 is about 938.4400639833.

The spelling of 826455780 in words is "eight hundred twenty-six million, four hundred fifty-five thousand, seven hundred eighty".