26431280 has 40 divisors (see below), whose sum is σ = 64690800. Its totient is φ = 10015488.

The previous prime is 26431271. The next prime is 26431289. The reversal of 26431280 is 8213462.

It is an interprime number because it is at equal distance from previous prime (26431271) and next prime (26431289).

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×26431280² = 1397225124876800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26431289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7175 + ... + 10214.

It is an arithmetic number, because the mean of its divisors is an integer number (1617270).

Almost surely, 2^26431280 is an apocalyptic number.

26431280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26431280 is an abundant number, since it is smaller than the sum of its proper divisors (38259520).

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

26431280 is a wasteful number, since it uses less digits than its factorization.

26431280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17421 (or 17415 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 26431280 is about 5141.1360612223. The cubic root of 26431280 is about 297.8786647753.

The spelling of 26431280 in words is "twenty-six million, four hundred thirty-one thousand, two hundred eighty".