28858409381 has 8 divisors (see below), whose sum is σ = 30557455704. Its totient is φ = 27159528960.

The previous prime is 28858409339. The next prime is 28858409413. The reversal of 28858409381 is 18390485882.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5466236356 + 23392173025 = 73934^2 + 152945^2 .

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 28858409381 - 2³⁴ = 11678540197 is a prime.

It is a super-2 number, since 2×28858409381² (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 (28858409681) 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, 602201 + ... + 648353.

It is an arithmetic number, because the mean of its divisors is an integer number (3819681963).

Almost surely, 2^28858409381 is an apocalyptic number.

It is an amenable number.

28858409381 is a deficient number, since it is larger than the sum of its proper divisors (1699046323).

28858409381 is a wasteful number, since it uses less digits than its factorization.

28858409381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82951.

The product of its (nonzero) digits is 4423680, while the sum is 56.

The spelling of 28858409381 in words is "twenty-eight billion, eight hundred fifty-eight million, four hundred nine thousand, three hundred eighty-one".