27980478 has 32 divisors (see below), whose sum is σ = 62956320. Its totient is φ = 9325368.

The previous prime is 27980471. The next prime is 27980497. The reversal of 27980478 is 87408972.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27980471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1176 + ... + 7572.

It is an arithmetic number, because the mean of its divisors is an integer number (1967385).

Almost surely, 2^27980478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27980478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31478160).

27980478 is an abundant number, since it is smaller than the sum of its proper divisors (34975842).

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

27980478 is an frugal number, since it uses more digits than its factorization.

27980478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6420 (or 6402 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 27980478 is about 5289.6576448765. The cubic root of 27980478 is about 303.5883090063.

The spelling of 27980478 in words is "twenty-seven million, nine hundred eighty thousand, four hundred seventy-eight".