26312778 has 12 divisors (see below), whose sum is σ = 57011058. Its totient is φ = 8770920.

The previous prime is 26312771. The next prime is 26312789. The reversal of 26312778 is 87721362.

It can be written as a sum of positive squares in only one way, i.e., 18173169 + 8139609 = 4263^2 + 2853^2 .

It is not an unprimeable number, because it can be changed into a prime (26312771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 730893 + ... + 730928.

Almost surely, 2^26312778 is an apocalyptic number.

26312778 is an abundant number, since it is smaller than the sum of its proper divisors (30698280).

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

26312778 is a wasteful number, since it uses less digits than its factorization.

26312778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461829 (or 1461826 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 26312778 is about 5129.5982298812. The cubic root of 26312778 is about 297.4328280895.

It can be divided in two parts, 263 and 12778, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 26312778 in words is "twenty-six million, three hundred twelve thousand, seven hundred seventy-eight".