28126699251 has 8 divisors (see below), whose sum is σ = 42859732224. Its totient is φ = 16072399560.

The previous prime is 28126699247. The next prime is 28126699277. The reversal of 28126699251 is 15299662182.

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

It is not a de Polignac number, because 28126699251 - 2² = 28126699247 is a prime.

It is a super-2 number, since 2×28126699251² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 28126699194 and 28126699203.

It is not an unprimeable number, because it can be changed into a prime (28126695251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 669683295 + ... + 669683336.

It is an arithmetic number, because the mean of its divisors is an integer number (5357466528).

Almost surely, 2^28126699251 is an apocalyptic number.

28126699251 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28126699251 is a deficient number, since it is larger than the sum of its proper divisors (14733032973).

28126699251 is a wasteful number, since it uses less digits than its factorization.

28126699251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339366641.

The product of its digits is 933120, while the sum is 51.

The spelling of 28126699251 in words is "twenty-eight billion, one hundred twenty-six million, six hundred ninety-nine thousand, two hundred fifty-one".