78577471 has 4 divisors (see below), whose sum is σ = 89802832. Its totient is φ = 67352112.

The previous prime is 78577463. The next prime is 78577481. The reversal of 78577471 is 17477587.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78577471 - 2³ = 78577463 is a prime.

It is a super-3 number, since 3×78577471³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78577481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5612670 + ... + 5612683.

It is an arithmetic number, because the mean of its divisors is an integer number (22450708).

Almost surely, 2^78577471 is an apocalyptic number.

78577471 is a deficient number, since it is larger than the sum of its proper divisors (11225361).

78577471 is a wasteful number, since it uses less digits than its factorization.

78577471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11225360.

The product of its digits is 384160, while the sum is 46.

The square root of 78577471 is about 8864.3934366656. The cubic root of 78577471 is about 428.3176940025.

The spelling of 78577471 in words is "seventy-eight million, five hundred seventy-seven thousand, four hundred seventy-one".