28770691207 has 4 divisors (see below), whose sum is σ = 28990314936. Its totient is φ = 28551067480.

The previous prime is 28770691199. The next prime is 28770691247. The reversal of 28770691207 is 70219607782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70219607782 = 2 ⋅35109803891.

It is not a de Polignac number, because 28770691207 - 2³ = 28770691199 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28770691247) 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, 109811668 + ... + 109811929.

It is an arithmetic number, because the mean of its divisors is an integer number (7247578734).

Almost surely, 2^28770691207 is an apocalyptic number.

28770691207 is a deficient number, since it is larger than the sum of its proper divisors (219623729).

28770691207 is a wasteful number, since it uses less digits than its factorization.

28770691207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219623728.

The product of its (nonzero) digits is 592704, while the sum is 49.

The spelling of 28770691207 in words is "twenty-eight billion, seven hundred seventy million, six hundred ninety-one thousand, two hundred seven".