78997253 has 4 divisors (see below), whose sum is σ = 79166880. Its totient is φ = 78827628.

The previous prime is 78997241. The next prime is 78997273. The reversal of 78997253 is 35279987.

It is a happy number.

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 78997253 - 2⁸ = 78996997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78997213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84113 + ... + 85046.

It is an arithmetic number, because the mean of its divisors is an integer number (19791720).

Almost surely, 2^78997253 is an apocalyptic number.

It is an amenable number.

78997253 is a deficient number, since it is larger than the sum of its proper divisors (169627).

78997253 is a wasteful number, since it uses less digits than its factorization.

78997253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169626.

The product of its digits is 952560, while the sum is 50.

The square root of 78997253 is about 8888.0398851490. The cubic root of 78997253 is about 429.0790692531.

The spelling of 78997253 in words is "seventy-eight million, nine hundred ninety-seven thousand, two hundred fifty-three".