126666780 has 48 divisors (see below), whose sum is σ = 366901920. Its totient is φ = 32612608.

The previous prime is 126666763. The next prime is 126666781. The reversal of 126666780 is 87666621.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126666781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34659 + ... + 38138.

It is an arithmetic number, because the mean of its divisors is an integer number (7643790).

Almost surely, 2^126666780 is an apocalyptic number.

126666780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126666780 is an abundant number, since it is smaller than the sum of its proper divisors (240235140).

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

126666780 is a wasteful number, since it uses less digits than its factorization.

126666780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72838 (or 72836 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 126666780 is about 11254.6337123871. The cubic root of 126666780 is about 502.2125679772.

The spelling of 126666780 in words is "one hundred twenty-six million, six hundred sixty-six thousand, seven hundred eighty".