28944531977 has 8 divisors (see below), whose sum is σ = 29226254400. Its totient is φ = 28663859664.

The previous prime is 28944531943. The next prime is 28944532009. The reversal of 28944531977 is 77913544982.

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

It is a cyclic number.

It is not a de Polignac number, because 28944531977 - 2¹² = 28944527881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28944531937) 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, 207077 + ... + 317442.

It is an arithmetic number, because the mean of its divisors is an integer number (3653281800).

Almost surely, 2^28944531977 is an apocalyptic number.

It is an amenable number.

28944531977 is a deficient number, since it is larger than the sum of its proper divisors (281722423).

28944531977 is a wasteful number, since it uses less digits than its factorization.

28944531977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525055.

The product of its digits is 15240960, while the sum is 59.

The spelling of 28944531977 in words is "twenty-eight billion, nine hundred forty-four million, five hundred thirty-one thousand, nine hundred seventy-seven".