126412778 has 4 divisors (see below), whose sum is σ = 189619170. Its totient is φ = 63206388.

The previous prime is 126412771. The next prime is 126412813. The reversal of 126412778 is 877214621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877214621 = 11317 ⋅77513.

It can be written as a sum of positive squares in only one way, i.e., 72199009 + 54213769 = 8497^2 + 7363^2 .

It is not an unprimeable number, because it can be changed into a prime (126412771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31603193 + ... + 31603196.

Almost surely, 2^126412778 is an apocalyptic number.

126412778 is a deficient number, since it is larger than the sum of its proper divisors (63206392).

126412778 is an equidigital number, since it uses as much as digits as its factorization.

126412778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63206391.

The product of its digits is 37632, while the sum is 38.

The square root of 126412778 is about 11243.3437197304. The cubic root of 126412778 is about 501.8766515456.

The spelling of 126412778 in words is "one hundred twenty-six million, four hundred twelve thousand, seven hundred seventy-eight".