78477487 has 4 divisors (see below), whose sum is σ = 85611816. Its totient is φ = 71343160.

The previous prime is 78477479. The next prime is 78477517.

It is a happy number.

78477487 is nontrivially palindromic in base 10.

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 78477487 - 2³ = 78477479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78477887) 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, 3567148 + ... + 3567169.

It is an arithmetic number, because the mean of its divisors is an integer number (21402954).

Almost surely, 2^78477487 is an apocalyptic number.

78477487 is a deficient number, since it is larger than the sum of its proper divisors (7134329).

78477487 is a wasteful number, since it uses less digits than its factorization.

78477487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7134328.

The product of its digits is 2458624, while the sum is 52.

The square root of 78477487 is about 8858.7520001409. The cubic root of 78477487 is about 428.1359494030.

The spelling of 78477487 in words is "seventy-eight million, four hundred seventy-seven thousand, four hundred eighty-seven".