266049990 has 24 divisors (see below), whose sum is σ = 691730208. Its totient is φ = 70946640.

The previous prime is 266049977. The next prime is 266049991. The reversal of 266049990 is 99940662.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266049991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1477966 + ... + 1478145.

It is an arithmetic number, because the mean of its divisors is an integer number (28822092).

Almost surely, 2^266049990 is an apocalyptic number.

266049990 is an abundant number, since it is smaller than the sum of its proper divisors (425680218).

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

266049990 is a wasteful number, since it uses less digits than its factorization.

266049990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2956124 (or 2956121 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 266049990 is about 16311.0389000824. The cubic root of 266049990 is about 643.1630444675.

It can be divided in two parts, 2660 and 49990, that added together give a triangular number (52650 = T₃₂₄).

The spelling of 266049990 in words is "two hundred sixty-six million, forty-nine thousand, nine hundred ninety".