26121690 has 160 divisors (see below), whose sum is σ = 85307904. Its totient is φ = 5598720.

The previous prime is 26121679. The next prime is 26121701. The reversal of 26121690 is 9612162.

It is an interprime number because it is at equal distance from previous prime (26121679) and next prime (26121701).

It is a super-2 number, since 2×26121690² = 1364685376912200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 96255 + ... + 96525.

Almost surely, 2^26121690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26121690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42653952).

26121690 is an abundant number, since it is smaller than the sum of its proper divisors (59186214).

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

26121690 is a wasteful number, since it uses less digits than its factorization.

26121690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 26121690 is about 5110.9382700244. The cubic root of 26121690 is about 296.7110750057.

The spelling of 26121690 in words is "twenty-six million, one hundred twenty-one thousand, six hundred ninety".