26402890 has 8 divisors (see below), whose sum is σ = 47525220. Its totient is φ = 10561152.

The previous prime is 26402869. The next prime is 26402899. The reversal of 26402890 is 9820462.

It can be written as a sum of positive squares in 2 ways, for example, as 25110121 + 1292769 = 5011^2 + 1137^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×26402890² = 1394225200704200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26402899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1320135 + ... + 1320154.

Almost surely, 2^26402890 is an apocalyptic number.

26402890 is a deficient number, since it is larger than the sum of its proper divisors (21122330).

26402890 is a wasteful number, since it uses less digits than its factorization.

26402890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640296.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 26402890 is about 5138.3742565134. The cubic root of 26402890 is about 297.7719754672.

The spelling of 26402890 in words is "twenty-six million, four hundred two thousand, eight hundred ninety".