253278646 has 4 divisors (see below), whose sum is σ = 379917972. Its totient is φ = 126639322.

The previous prime is 253278601. The next prime is 253278647. The reversal of 253278646 is 646872352.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253278647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63319660 + ... + 63319663.

It is an arithmetic number, because the mean of its divisors is an integer number (94979493).

Almost surely, 2^253278646 is an apocalyptic number.

253278646 is a deficient number, since it is larger than the sum of its proper divisors (126639326).

253278646 is a wasteful number, since it uses less digits than its factorization.

253278646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126639325.

The product of its digits is 483840, while the sum is 43.

The square root of 253278646 is about 15914.7304721129. The cubic root of 253278646 is about 632.7024632666.

The spelling of 253278646 in words is "two hundred fifty-three million, two hundred seventy-eight thousand, six hundred forty-six".