26981890 has 64 divisors (see below), whose sum is σ = 57425760. Its totient is φ = 9031680.

The previous prime is 26981887. The next prime is 26981909. The reversal of 26981890 is 9818962.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 139129 + 26842761 = 373^2 + 5181^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63880 + ... + 64300.

Almost surely, 2^26981890 is an apocalyptic number.

26981890 is an abundant number, since it is smaller than the sum of its proper divisors (30443870).

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

26981890 is a wasteful number, since it uses less digits than its factorization.

26981890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 26981890 is about 5194.4094948319. The cubic root of 26981890 is about 299.9329109239.

The spelling of 26981890 in words is "twenty-six million, nine hundred eighty-one thousand, eight hundred ninety".