815266620 has 240 divisors, whose sum is σ = 3095547840. Its totient is φ = 175343616.

The previous prime is 815266619. The next prime is 815266631. The reversal of 815266620 is 26662518.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 190666 + ... + 194894.

It is an arithmetic number, because the mean of its divisors is an integer number (12898116).

Almost surely, 2^815266620 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 815266620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1547773920).

815266620 is an abundant number, since it is smaller than the sum of its proper divisors (2280281220).

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

815266620 is a wasteful number, since it uses less digits than its factorization.

815266620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4274 (or 4263 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 815266620 is about 28552.8741110243. The cubic root of 815266620 is about 934.1857113977.

The spelling of 815266620 in words is "eight hundred fifteen million, two hundred sixty-six thousand, six hundred twenty".