78303251 has 4 divisors (see below), whose sum is σ = 84326592. Its totient is φ = 72279912.

The previous prime is 78303229. The next prime is 78303259. The reversal of 78303251 is 15230387.

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

It is a cyclic number.

It is not a de Polignac number, because 78303251 - 2⁶ = 78303187 is a prime.

It is a super-2 number, since 2×78303251² = 12262798234338002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78303259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3011651 + ... + 3011676.

It is an arithmetic number, because the mean of its divisors is an integer number (21081648).

Almost surely, 2^78303251 is an apocalyptic number.

78303251 is a deficient number, since it is larger than the sum of its proper divisors (6023341).

78303251 is a wasteful number, since it uses less digits than its factorization.

78303251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6023340.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 78303251 is about 8848.9124190490. The cubic root of 78303251 is about 427.8188649628.

The spelling of 78303251 in words is "seventy-eight million, three hundred three thousand, two hundred fifty-one".