28723977986 has 8 divisors (see below), whose sum is σ = 47002873104. Its totient is φ = 13056353620.

The previous prime is 28723977983. The next prime is 28723978009. The reversal of 28723977986 is 68977932782.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28723977986² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28723977983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 652817660 + ... + 652817703.

It is an arithmetic number, because the mean of its divisors is an integer number (5875359138).

Almost surely, 2^28723977986 is an apocalyptic number.

28723977986 is a deficient number, since it is larger than the sum of its proper divisors (18278895118).

28723977986 is a wasteful number, since it uses less digits than its factorization.

28723977986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305635376.

The product of its digits is 128024064, while the sum is 68.

The spelling of 28723977986 in words is "twenty-eight billion, seven hundred twenty-three million, nine hundred seventy-seven thousand, nine hundred eighty-six".