26978490 has 192 divisors, whose sum is σ = 93000960. Its totient is φ = 5253120.

The previous prime is 26978489. The next prime is 26978503. The reversal of 26978490 is 9487962.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 117696 + ... + 117924.

It is an arithmetic number, because the mean of its divisors is an integer number (484380).

Almost surely, 2^26978490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26978490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46500480).

26978490 is an abundant number, since it is smaller than the sum of its proper divisors (66022470).

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

26978490 is a wasteful number, since it uses less digits than its factorization.

26978490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 26978490 is about 5194.0822095920. The cubic root of 26978490 is about 299.9203121680.

The spelling of 26978490 in words is "twenty-six million, nine hundred seventy-eight thousand, four hundred ninety".