26199990 has 64 divisors (see below), whose sum is σ = 72921600. Its totient is φ = 6681312.

The previous prime is 26199989. The next prime is 26199997. The reversal of 26199990 is 9999162.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26199997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4101 + ... + 8319.

It is an arithmetic number, because the mean of its divisors is an integer number (1139400).

Almost surely, 2^26199990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26199990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36460800).

26199990 is an abundant number, since it is smaller than the sum of its proper divisors (46721610).

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

26199990 is a wasteful number, since it uses less digits than its factorization.

26199990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4258 (or 4252 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The square root of 26199990 is about 5118.5925799970. The cubic root of 26199990 is about 297.0072439821.

The spelling of 26199990 in words is "twenty-six million, one hundred ninety-nine thousand, nine hundred ninety".