26661540 has 48 divisors (see below), whose sum is σ = 74878272. Its totient is φ = 7088256.

The previous prime is 26661539. The next prime is 26661553. The reversal of 26661540 is 4516662.

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

It is a junction number, because it is equal to n+sod(n) for n = 26661498 and 26661507.

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, 34842 + ... + 35598.

It is an arithmetic number, because the mean of its divisors is an integer number (1559964).

Almost surely, 2^26661540 is an apocalyptic number.

26661540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26661540 is an abundant number, since it is smaller than the sum of its proper divisors (48216732).

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

26661540 is a wasteful number, since it uses less digits than its factorization.

26661540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356 (or 1354 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 26661540 is about 5163.4813837178. The cubic root of 26661540 is about 298.7411696532.

The spelling of 26661540 in words is "twenty-six million, six hundred sixty-one thousand, five hundred forty".