28057730506 has 48 divisors (see below), whose sum is σ = 45969693696. Its totient is φ = 12837547008.

The previous prime is 28057730497. The next prime is 28057730507. The reversal of 28057730506 is 60503775082.

It is a super-2 number, since 2×28057730506² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28057730507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24984061 + ... + 24985183.

It is an arithmetic number, because the mean of its divisors is an integer number (957701952).

Almost surely, 2^28057730506 is an apocalyptic number.

28057730506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28057730506 is a deficient number, since it is larger than the sum of its proper divisors (17911963190).

28057730506 is a wasteful number, since it uses less digits than its factorization.

28057730506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1727 (or 1714 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 28057730506 in words is "twenty-eight billion, fifty-seven million, seven hundred thirty thousand, five hundred six".