26909287878 has 16 divisors (see below), whose sum is σ = 58711173696. Its totient is φ = 8154329640.

The previous prime is 26909287819. The next prime is 26909287901. The reversal of 26909287878 is 87878290962.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (66), and also a Moran number because the ratio is a prime number: 407716483 = 26909287878 / (2 + 6 + 9 + 0 + 9 + 2 + 8 + 7 + 8 + 7 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203858176 + ... + 203858307.

It is an arithmetic number, because the mean of its divisors is an integer number (3669448356).

Almost surely, 2^26909287878 is an apocalyptic number.

26909287878 is an abundant number, since it is smaller than the sum of its proper divisors (31801885818).

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

26909287878 is a wasteful number, since it uses less digits than its factorization.

26909287878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407716499.

The product of its (nonzero) digits is 48771072, while the sum is 66.

The spelling of 26909287878 in words is "twenty-six billion, nine hundred nine million, two hundred eighty-seven thousand, eight hundred seventy-eight".