28476721907 has 6 divisors (see below), whose sum is σ = 28561940268. Its totient is φ = 28391522012.

The previous prime is 28476721901. The next prime is 28476721943. The reversal of 28476721907 is 70912767482.

It is a de Polignac number, because none of the positive numbers 2^k-28476721907 is a prime.

It is a super-2 number, since 2×28476721907² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28476721901) 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 5 ways as a sum of consecutive naturals, for example, 3138944 + ... + 3148002.

It is an arithmetic number, because the mean of its divisors is an integer number (4760323378).

Almost surely, 2^28476721907 is an apocalyptic number.

28476721907 is a deficient number, since it is larger than the sum of its proper divisors (85218361).

28476721907 is an frugal number, since it uses more digits than its factorization.

28476721907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18465 (or 9406 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 53.

The spelling of 28476721907 in words is "twenty-eight billion, four hundred seventy-six million, seven hundred twenty-one thousand, nine hundred seven".