28197759958 has 4 divisors (see below), whose sum is σ = 42296639940. Its totient is φ = 14098879978.

The previous prime is 28197759943. The next prime is 28197759959. The reversal of 28197759958 is 85995779182.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×28197759958² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28197759959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7049439988 + ... + 7049439991.

It is an arithmetic number, because the mean of its divisors is an integer number (10574159985).

Almost surely, 2^28197759958 is an apocalyptic number.

28197759958 is a deficient number, since it is larger than the sum of its proper divisors (14098879982).

28197759958 is a wasteful number, since it uses less digits than its factorization.

28197759958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14098879981.

The product of its digits is 114307200, while the sum is 70.

The spelling of 28197759958 in words is "twenty-eight billion, one hundred ninety-seven million, seven hundred fifty-nine thousand, nine hundred fifty-eight".