78461571 has 16 divisors (see below), whose sum is σ = 109478304. Its totient is φ = 49929984.

The previous prime is 78461567. The next prime is 78461573. The reversal of 78461571 is 17516487.

It is not a de Polignac number, because 78461571 - 2² = 78461567 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78461573) 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 15 ways as a sum of consecutive naturals, for example, 786 + ... + 12551.

It is an arithmetic number, because the mean of its divisors is an integer number (6842394).

Almost surely, 2^78461571 is an apocalyptic number.

78461571 is a deficient number, since it is larger than the sum of its proper divisors (31016733).

78461571 is a wasteful number, since it uses less digits than its factorization.

78461571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13430.

The product of its digits is 47040, while the sum is 39.

The square root of 78461571 is about 8857.8536339228. The cubic root of 78461571 is about 428.1070040636.

The spelling of 78461571 in words is "seventy-eight million, four hundred sixty-one thousand, five hundred seventy-one".