78471515 has 8 divisors (see below), whose sum is σ = 98260128. Its totient is φ = 60047680.

The previous prime is 78471511. The next prime is 78471527. The reversal of 78471515 is 51517487.

It is a happy number.

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

It is not a de Polignac number, because 78471515 - 2² = 78471511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78471511) 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, 341066 + ... + 341295.

It is an arithmetic number, because the mean of its divisors is an integer number (12282516).

Almost surely, 2^78471515 is an apocalyptic number.

78471515 is a deficient number, since it is larger than the sum of its proper divisors (19788613).

78471515 is a wasteful number, since it uses less digits than its factorization.

78471515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682389.

The product of its digits is 39200, while the sum is 38.

The square root of 78471515 is about 8858.4149259334. The cubic root of 78471515 is about 428.1250889942.

The spelling of 78471515 in words is "seventy-eight million, four hundred seventy-one thousand, five hundred fifteen".