26978780 has 12 divisors (see below), whose sum is σ = 56655480. Its totient is φ = 10791504.

The previous prime is 26978767. The next prime is 26978797. The reversal of 26978780 is 8787962.

It is a congruent number.

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, 674450 + ... + 674489.

It is an arithmetic number, because the mean of its divisors is an integer number (4721290).

Almost surely, 2^26978780 is an apocalyptic number.

26978780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26978780 is an abundant number, since it is smaller than the sum of its proper divisors (29676700).

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

26978780 is a wasteful number, since it uses less digits than its factorization.

26978780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348948 (or 1348946 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 26978780 is about 5194.1101259022. The cubic root of 26978780 is about 299.9213868091.

The spelling of 26978780 in words is "twenty-six million, nine hundred seventy-eight thousand, seven hundred eighty".