78897291 has 32 divisors (see below), whose sum is σ = 126074880. Its totient is φ = 43322400.

The previous prime is 78897251. The next prime is 78897311. The reversal of 78897291 is 19279887.

It is not a de Polignac number, because 78897291 - 2⁷ = 78897163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78897241) 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 31 ways as a sum of consecutive naturals, for example, 11686 + ... + 17156.

It is an arithmetic number, because the mean of its divisors is an integer number (3939840).

Almost surely, 2^78897291 is an apocalyptic number.

78897291 is a deficient number, since it is larger than the sum of its proper divisors (47177589).

78897291 is a wasteful number, since it uses less digits than its factorization.

78897291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5527.

The product of its digits is 508032, while the sum is 51.

The square root of 78897291 is about 8882.4147054728. The cubic root of 78897291 is about 428.8980093450.

The spelling of 78897291 in words is "seventy-eight million, eight hundred ninety-seven thousand, two hundred ninety-one".