26400990 has 96 divisors (see below), whose sum is σ = 79672320. Its totient is φ = 5480640.

The previous prime is 26400989. The next prime is 26401003. The reversal of 26400990 is 9900462.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24891 + ... + 25929.

It is an arithmetic number, because the mean of its divisors is an integer number (829920).

Almost surely, 2^26400990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26400990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39836160).

26400990 is an abundant number, since it is smaller than the sum of its proper divisors (53271330).

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

26400990 is a wasteful number, since it uses less digits than its factorization.

26400990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078 (or 1067 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 26400990 is about 5138.1893698072. The cubic root of 26400990 is about 297.7648325581.

The spelling of 26400990 in words is "twenty-six million, four hundred thousand, nine hundred ninety".