1266502890 has 64 divisors (see below), whose sum is σ = 3286946304. Its totient is φ = 311098368.

The previous prime is 1266502849. The next prime is 1266502901. The reversal of 1266502890 is 982056621.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2449 + ... + 50388.

It is an arithmetic number, because the mean of its divisors is an integer number (51358536).

Almost surely, 2^1266502890 is an apocalyptic number.

1266502890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266502890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1643473152).

1266502890 is an abundant number, since it is smaller than the sum of its proper divisors (2020443414).

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

1266502890 is a wasteful number, since it uses less digits than its factorization.

1266502890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52911.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 1266502890 is about 35587.9599021916. The cubic root of 1266502890 is about 1081.9372209582.

The spelling of 1266502890 in words is "one billion, two hundred sixty-six million, five hundred two thousand, eight hundred ninety".