1266628540 has 24 divisors (see below), whose sum is σ = 2799916560. Its totient is φ = 479985408.

The previous prime is 1266628529. The next prime is 1266628547. The reversal of 1266628540 is 458266621.

It is a junction number, because it is equal to n+sod(n) for n = 1266628493 and 1266628502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266628547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1666237 + ... + 1666996.

It is an arithmetic number, because the mean of its divisors is an integer number (116663190).

Almost surely, 2^1266628540 is an apocalyptic number.

1266628540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266628540 is an abundant number, since it is smaller than the sum of its proper divisors (1533288020).

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

1266628540 is a wasteful number, since it uses less digits than its factorization.

1266628540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333261 (or 3333259 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 1266628540 is about 35589.7252026480. The cubic root of 1266628540 is about 1081.9729995096.

The spelling of 1266628540 in words is "one billion, two hundred sixty-six million, six hundred twenty-eight thousand, five hundred forty".