28872478 has 4 divisors (see below), whose sum is σ = 43308720. Its totient is φ = 14436238.

The previous prime is 28872461. The next prime is 28872497. The reversal of 28872478 is 87427882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87427882 = 2 ⋅43713941.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7218118 + ... + 7218121.

It is an arithmetic number, because the mean of its divisors is an integer number (10827180).

Almost surely, 2^28872478 is an apocalyptic number.

28872478 is a deficient number, since it is larger than the sum of its proper divisors (14436242).

28872478 is a wasteful number, since it uses less digits than its factorization.

28872478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14436241.

The product of its digits is 401408, while the sum is 46.

The square root of 28872478 is about 5373.3116418090. The cubic root of 28872478 is about 306.7806898509.

The spelling of 28872478 in words is "twenty-eight million, eight hundred seventy-two thousand, four hundred seventy-eight".