28904472890 has 16 divisors (see below), whose sum is σ = 53434215432. Its totient is φ = 11249308224.

The previous prime is 28904472871. The next prime is 28904472901. The reversal of 28904472890 is 9827440982.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 28784854921 + 119617969 = 169661^2 + 10937^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39059729 + ... + 39060468.

Almost surely, 2^28904472890 is an apocalyptic number.

28904472890 is a deficient number, since it is larger than the sum of its proper divisors (24529742542).

28904472890 is a wasteful number, since it uses less digits than its factorization.

28904472890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78120241.

The product of its (nonzero) digits is 2322432, while the sum is 53.

The spelling of 28904472890 in words is "twenty-eight billion, nine hundred four million, four hundred seventy-two thousand, eight hundred ninety".