28511747949 has 8 divisors (see below), whose sum is σ = 38031870880. Its totient is φ = 18999728496.

The previous prime is 28511747939. The next prime is 28511747951. The reversal of 28511747949 is 94974711582.

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

It is not a de Polignac number, because 28511747949 - 2³³ = 19921813357 is a prime.

It is a super-2 number, since 2×28511747949² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28511747939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2017654 + ... + 2031735.

It is an arithmetic number, because the mean of its divisors is an integer number (4753983860).

Almost surely, 2^28511747949 is an apocalyptic number.

It is an amenable number.

28511747949 is a deficient number, since it is larger than the sum of its proper divisors (9520122931).

28511747949 is a wasteful number, since it uses less digits than its factorization.

28511747949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051739.

The product of its digits is 5080320, while the sum is 57.

The spelling of 28511747949 in words is "twenty-eight billion, five hundred eleven million, seven hundred forty-seven thousand, nine hundred forty-nine".