28778476 has 12 divisors (see below), whose sum is σ = 51434208. Its totient is φ = 14082992.

The previous prime is 28778471. The next prime is 28778531. The reversal of 28778476 is 67487782.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28778471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76351 + ... + 76726.

It is an arithmetic number, because the mean of its divisors is an integer number (4286184).

Almost surely, 2^28778476 is an apocalyptic number.

It is an amenable number.

28778476 is a deficient number, since it is larger than the sum of its proper divisors (22655732).

28778476 is a wasteful number, since it uses less digits than its factorization.

28778476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153128 (or 153126 counting only the distinct ones).

The product of its digits is 1053696, while the sum is 49.

The square root of 28778476 is about 5364.5573908758. The cubic root of 28778476 is about 306.4473926105.

The spelling of 28778476 in words is "twenty-eight million, seven hundred seventy-eight thousand, four hundred seventy-six".