78474477 has 4 divisors (see below), whose sum is σ = 104632640. Its totient is φ = 52316316.

The previous prime is 78474463. The next prime is 78474479. The reversal of 78474477 is 77447487.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 78474477 - 2¹⁹ = 77950189 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78474479) 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, 13079077 + ... + 13079082.

It is an arithmetic number, because the mean of its divisors is an integer number (26158160).

Almost surely, 2^78474477 is an apocalyptic number.

It is an amenable number.

78474477 is a deficient number, since it is larger than the sum of its proper divisors (26158163).

78474477 is a wasteful number, since it uses less digits than its factorization.

78474477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26158162.

The product of its digits is 1229312, while the sum is 48.

The square root of 78474477 is about 8858.5821100219. The cubic root of 78474477 is about 428.1304756222.

The spelling of 78474477 in words is "seventy-eight million, four hundred seventy-four thousand, four hundred seventy-seven".