126878561 has 8 divisors (see below), whose sum is σ = 133921920. Its totient is φ = 119871792.

The previous prime is 126878551. The next prime is 126878573. The reversal of 126878561 is 165878621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 126878561 - 2¹⁰ = 126877537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126878551) 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, 1865 + ... + 16038.

It is an arithmetic number, because the mean of its divisors is an integer number (16740240).

Almost surely, 2^126878561 is an apocalyptic number.

It is an amenable number.

126878561 is a deficient number, since it is larger than the sum of its proper divisors (7043359).

126878561 is a wasteful number, since it uses less digits than its factorization.

126878561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18295.

The product of its digits is 161280, while the sum is 44.

The square root of 126878561 is about 11264.0383965965. The cubic root of 126878561 is about 502.4923041980.

The spelling of 126878561 in words is "one hundred twenty-six million, eight hundred seventy-eight thousand, five hundred sixty-one".