78637253 has 8 divisors (see below), whose sum is σ = 82359168. Its totient is φ = 74940624.

The previous prime is 78637201. The next prime is 78637259. The reversal of 78637253 is 35273687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78637253 - 2¹² = 78633157 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 78637253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78637259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200 + ... + 12542.

It is an arithmetic number, because the mean of its divisors is an integer number (10294896).

Almost surely, 2^78637253 is an apocalyptic number.

It is an amenable number.

78637253 is a deficient number, since it is larger than the sum of its proper divisors (3721915).

78637253 is a wasteful number, since it uses less digits than its factorization.

78637253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12643.

The product of its digits is 211680, while the sum is 41.

The square root of 78637253 is about 8867.7648254789. The cubic root of 78637253 is about 428.4262883073.

The spelling of 78637253 in words is "seventy-eight million, six hundred thirty-seven thousand, two hundred fifty-three".