28406396928 has 576 divisors, whose sum is σ = 99374446080. Its totient is φ = 7013597184.

The previous prime is 28406396917. The next prime is 28406396929. The reversal of 28406396928 is 82969360482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28406396929) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 604391401 + ... + 604391447.

It is an arithmetic number, because the mean of its divisors is an integer number (172525080).

Almost surely, 2^28406396928 is an apocalyptic number.

28406396928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28406396928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49687223040).

28406396928 is an abundant number, since it is smaller than the sum of its proper divisors (70968049152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28406396928 is a wasteful number, since it uses less digits than its factorization.

28406396928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 57.

The spelling of 28406396928 in words is "twenty-eight billion, four hundred six million, three hundred ninety-six thousand, nine hundred twenty-eight".