26631990 has 240 divisors, whose sum is σ = 92364624. Its totient is φ = 5443200.

The previous prime is 26631973. The next prime is 26632003. The reversal of 26631990 is 9913662.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 436560 + ... + 436620.

Almost surely, 2^26631990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26631990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46182312).

26631990 is an abundant number, since it is smaller than the sum of its proper divisors (65732634).

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

26631990 is a wasteful number, since it uses less digits than its factorization.

26631990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 26631990 is about 5160.6191489006. The cubic root of 26631990 is about 298.6307601148.

The spelling of 26631990 in words is "twenty-six million, six hundred thirty-one thousand, nine hundred ninety".