78285291 has 16 divisors (see below), whose sum is σ = 121728000. Its totient is φ = 44733864.

The previous prime is 78285281. The next prime is 78285299. The reversal of 78285291 is 19258287.

It is not a de Polignac number, because 78285291 - 2⁶ = 78285227 is a prime.

It is a super-2 number, since 2×78285291² = 12257173573909362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78285299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37011 + ... + 39068.

It is an arithmetic number, because the mean of its divisors is an integer number (7608000).

Almost surely, 2^78285291 is an apocalyptic number.

78285291 is a deficient number, since it is larger than the sum of its proper divisors (43442709).

78285291 is an equidigital number, since it uses as much as digits as its factorization.

78285291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76103 (or 76089 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 78285291 is about 8847.8975468752. The cubic root of 78285291 is about 427.7861536162.

The spelling of 78285291 in words is "seventy-eight million, two hundred eighty-five thousand, two hundred ninety-one".