78733257 has 8 divisors (see below), whose sum is σ = 105041376. Its totient is φ = 52456992.

The previous prime is 78733253. The next prime is 78733261. The reversal of 78733257 is 75233787.

It is an interprime number because it is at equal distance from previous prime (78733253) and next prime (78733261).

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

It is not a de Polignac number, because 78733257 - 2² = 78733253 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (78733253) 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, 1428 + ... + 12629.

It is an arithmetic number, because the mean of its divisors is an integer number (13130172).

Almost surely, 2^78733257 is an apocalyptic number.

It is an amenable number.

78733257 is a deficient number, since it is larger than the sum of its proper divisors (26308119).

78733257 is a wasteful number, since it uses less digits than its factorization.

78733257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15927.

The product of its digits is 246960, while the sum is 42.

The square root of 78733257 is about 8873.1762633231. The cubic root of 78733257 is about 428.6005649556.

The spelling of 78733257 in words is "seventy-eight million, seven hundred thirty-three thousand, two hundred fifty-seven".