5278781 has 4 divisors (see below), whose sum is σ = 5300064. Its totient is φ = 5257500.

The previous prime is 5278771. The next prime is 5278787. The reversal of 5278781 is 1878725.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5278781 - 2²² = 1084477 is a prime.

It is a super-2 number, since 2×5278781² = 55731057691922, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5278787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10265 + ... + 10766.

It is an arithmetic number, because the mean of its divisors is an integer number (1325016).

Almost surely, 2^5278781 is an apocalyptic number.

5278781 is the 1028-th centered decagonal number.

It is an amenable number.

5278781 is a deficient number, since it is larger than the sum of its proper divisors (21283).

5278781 is a wasteful number, since it uses less digits than its factorization.

5278781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21282.

The product of its digits is 31360, while the sum is 38.

The square root of 5278781 is about 2297.5597924755. The cubic root of 5278781 is about 174.1183521224.

The spelling of 5278781 in words is "five million, two hundred seventy-eight thousand, seven hundred eighty-one".