266628440 has 32 divisors (see below), whose sum is σ = 646062480. Its totient is φ = 98447232.

The previous prime is 266628433. The next prime is 266628451. The reversal of 266628440 is 44826662.

It is a junction number, because it is equal to n+sod(n) for n = 266628394 and 266628403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255854 + ... + 256893.

Almost surely, 2^266628440 is an apocalyptic number.

266628440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266628440 is an abundant number, since it is smaller than the sum of its proper divisors (379434040).

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

266628440 is a wasteful number, since it uses less digits than its factorization.

266628440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512771 (or 512767 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 38.

The square root of 266628440 is about 16328.7611287568. The cubic root of 266628440 is about 643.6288320666.

The spelling of 266628440 in words is "two hundred sixty-six million, six hundred twenty-eight thousand, four hundred forty".