125777778 has 32 divisors (see below), whose sum is σ = 291548160. Its totient is φ = 35429520.

The previous prime is 125777767. The next prime is 125777797. The reversal of 125777778 is 877777521.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 125777778.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18108 + ... + 24071.

It is an arithmetic number, because the mean of its divisors is an integer number (9110880).

Almost surely, 2^125777778 is an apocalyptic number.

125777778 is an abundant number, since it is smaller than the sum of its proper divisors (165770382).

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

125777778 is a wasteful number, since it uses less digits than its factorization.

125777778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42262.

The product of its digits is 1344560, while the sum is 51.

The square root of 125777778 is about 11215.0692374145. The cubic root of 125777778 is about 501.0348938450.

The spelling of 125777778 in words is "one hundred twenty-five million, seven hundred seventy-seven thousand, seven hundred seventy-eight".