1266608628 has 72 divisors (see below), whose sum is σ = 3433903200. Its totient is φ = 392423616.

The previous prime is 1266608617. The next prime is 1266608657. The reversal of 1266608628 is 8268066621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18783 + ... + 53721.

It is an arithmetic number, because the mean of its divisors is an integer number (47693100).

Almost surely, 2^1266608628 is an apocalyptic number.

1266608628 is a gapful number since it is divisible by the number (18) 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 1266608628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1716951600).

1266608628 is an abundant number, since it is smaller than the sum of its proper divisors (2167294572).

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

1266608628 is a wasteful number, since it uses less digits than its factorization.

1266608628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35021 (or 35016 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 1266608628 is about 35589.4454578882. The cubic root of 1266608628 is about 1081.9673297707.

The spelling of 1266608628 in words is "one billion, two hundred sixty-six million, six hundred eight thousand, six hundred twenty-eight".