47978578 has 4 divisors (see below), whose sum is σ = 71967870. Its totient is φ = 23989288.

The previous prime is 47978551. The next prime is 47978597. The reversal of 47978578 is 87587974.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 41254929 + 6723649 = 6423^2 + 2593^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11994643 + ... + 11994646.

Almost surely, 2^47978578 is an apocalyptic number.

47978578 is a deficient number, since it is larger than the sum of its proper divisors (23989292).

47978578 is a wasteful number, since it uses less digits than its factorization.

47978578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23989291.

The product of its digits is 3951360, while the sum is 55.

The square root of 47978578 is about 6926.6570580620. The cubic root of 47978578 is about 363.3700461364.

The spelling of 47978578 in words is "forty-seven million, nine hundred seventy-eight thousand, five hundred seventy-eight".