26531970 has 64 divisors (see below), whose sum is σ = 67239936. Its totient is φ = 6690240.

The previous prime is 26531963. The next prime is 26531971. The reversal of 26531970 is 7913562.

26531970 is a nontrivial binomial coefficient, being equal to C(7285, 2).

It is not an unprimeable number, because it can be changed into a prime (26531971) 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, 43407 + ... + 44013.

It is an arithmetic number, because the mean of its divisors is an integer number (1050624).

Almost surely, 2^26531970 is an apocalyptic number.

26531970 is the 7284-th triangular number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26531970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33619968).

26531970 is an abundant number, since it is smaller than the sum of its proper divisors (40707966).

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

26531970 is a wasteful number, since it uses less digits than its factorization.

26531970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 26531970 is about 5150.9193354196. The cubic root of 26531970 is about 298.2564418702.

It can be divided in two parts, 26 and 531970, that added together give a triangular number (531996 = T₁₀₃₁).

The spelling of 26531970 in words is "twenty-six million, five hundred thirty-one thousand, nine hundred seventy".