28977813987 has 8 divisors (see below), whose sum is σ = 39102592704. Its totient is φ = 19085788968.

The previous prime is 28977813967. The next prime is 28977814037. The reversal of 28977813987 is 78931877982.

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

It is not a de Polignac number, because 28977813987 - 2¹⁵ = 28977781219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28977813967) 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, 58188133 + ... + 58188630.

It is an arithmetic number, because the mean of its divisors is an integer number (4887824088).

Almost surely, 2^28977813987 is an apocalyptic number.

28977813987 is a deficient number, since it is larger than the sum of its proper divisors (10124778717).

28977813987 is a wasteful number, since it uses less digits than its factorization.

28977813987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116376849.

The product of its digits is 85349376, while the sum is 69.

The spelling of 28977813987 in words is "twenty-eight billion, nine hundred seventy-seven million, eight hundred thirteen thousand, nine hundred eighty-seven".