23278457 has 4 divisors (see below), whose sum is σ = 24647796. Its totient is φ = 21909120.

The previous prime is 23278441. The next prime is 23278471. The reversal of 23278457 is 75487232.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17147881 + 6130576 = 4141^2 + 2476^2 .

It is a cyclic number.

It is not a de Polignac number, because 23278457 - 2⁴ = 23278441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23278457.

It is not an unprimeable number, because it can be changed into a prime (23278417) 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, 684644 + ... + 684677.

It is an arithmetic number, because the mean of its divisors is an integer number (6161949).

Almost surely, 2^23278457 is an apocalyptic number.

It is an amenable number.

23278457 is a deficient number, since it is larger than the sum of its proper divisors (1369339).

23278457 is a wasteful number, since it uses less digits than its factorization.

23278457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369338.

The product of its digits is 94080, while the sum is 38.

The square root of 23278457 is about 4824.7753315569. The cubic root of 23278457 is about 285.5297707583.

The spelling of 23278457 in words is "twenty-three million, two hundred seventy-eight thousand, four hundred fifty-seven".