26145640 has 16 divisors (see below), whose sum is σ = 58827780. Its totient is φ = 10458240.

The previous prime is 26145599. The next prime is 26145661. The reversal of 26145640 is 4654162.

It can be written as a sum of positive squares in 2 ways, for example, as 24940036 + 1205604 = 4994^2 + 1098^2 .

It is a junction number, because it is equal to n+sod(n) for n = 26145599 and 26145608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326781 + ... + 326860.

Almost surely, 2^26145640 is an apocalyptic number.

26145640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26145640 is an abundant number, since it is smaller than the sum of its proper divisors (32682140).

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

26145640 is a wasteful number, since it uses less digits than its factorization.

26145640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653652 (or 653648 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 26145640 is about 5113.2807472307. The cubic root of 26145640 is about 296.8017283993.

The spelling of 26145640 in words is "twenty-six million, one hundred forty-five thousand, six hundred forty".