26139720 has 64 divisors (see below), whose sum is σ = 79727040. Its totient is φ = 6854400.

The previous prime is 26139713. The next prime is 26139739. The reversal of 26139720 is 2793162.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5535 + ... + 9105.

It is an arithmetic number, because the mean of its divisors is an integer number (1245735).

Almost surely, 2^26139720 is an apocalyptic number.

26139720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26139720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39863520).

26139720 is an abundant number, since it is smaller than the sum of its proper divisors (53587320).

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

26139720 is a wasteful number, since it uses less digits than its factorization.

26139720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3646 (or 3642 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 26139720 is about 5112.7018297569. The cubic root of 26139720 is about 296.7793256984.

The spelling of 26139720 in words is "twenty-six million, one hundred thirty-nine thousand, seven hundred twenty".