78472505 has 4 divisors (see below), whose sum is σ = 94167012. Its totient is φ = 62778000.

The previous prime is 78472447. The next prime is 78472529. The reversal of 78472505 is 50527487.

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

It can be written as a sum of positive squares in 2 ways, for example, as 57942544 + 20529961 = 7612^2 + 4531^2 .

It is not a de Polignac number, because 78472505 - 2¹⁴ = 78456121 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7847246 + ... + 7847255.

It is an arithmetic number, because the mean of its divisors is an integer number (23541753).

Almost surely, 2^78472505 is an apocalyptic number.

It is an amenable number.

78472505 is a deficient number, since it is larger than the sum of its proper divisors (15694507).

78472505 is a wasteful number, since it uses less digits than its factorization.

78472505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15694506.

The product of its (nonzero) digits is 78400, while the sum is 38.

The square root of 78472505 is about 8858.4708048286. The cubic root of 78472505 is about 428.1268894015.

The spelling of 78472505 in words is "seventy-eight million, four hundred seventy-two thousand, five hundred five".