78431853 has 16 divisors (see below), whose sum is σ = 106076736. Its totient is φ = 51542400.

The previous prime is 78431839. The next prime is 78431869. The reversal of 78431853 is 35813487.

It is not a de Polignac number, because 78431853 - 2⁶ = 78431789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78431833) 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, 94426 + ... + 95252.

It is an arithmetic number, because the mean of its divisors is an integer number (6629796).

Almost surely, 2^78431853 is an apocalyptic number.

It is an amenable number.

78431853 is a deficient number, since it is larger than the sum of its proper divisors (27644883).

78431853 is a wasteful number, since it uses less digits than its factorization.

78431853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244.

The product of its digits is 80640, while the sum is 39.

The square root of 78431853 is about 8856.1759806363. The cubic root of 78431853 is about 428.0529474922.

The spelling of 78431853 in words is "seventy-eight million, four hundred thirty-one thousand, eight hundred fifty-three".