28478088946 has 4 divisors (see below), whose sum is σ = 42717133422. Its totient is φ = 14239044472.

The previous prime is 28478088931. The next prime is 28478088959. The reversal of 28478088946 is 64988087482.

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., 23161491721 + 5316597225 = 152189^2 + 72915^2 .

It is a super-2 number, since 2×28478088946² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7119522235 + ... + 7119522238.

Almost surely, 2^28478088946 is an apocalyptic number.

28478088946 is a deficient number, since it is larger than the sum of its proper divisors (14239044476).

28478088946 is a wasteful number, since it uses less digits than its factorization.

28478088946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14239044475.

The product of its (nonzero) digits is 49545216, while the sum is 64.

The spelling of 28478088946 in words is "twenty-eight billion, four hundred seventy-eight million, eighty-eight thousand, nine hundred forty-six".