28897538070 has 64 divisors (see below), whose sum is σ = 71815403520. Its totient is φ = 7433048448.

The previous prime is 28897538069. The next prime is 28897538081. The reversal of 28897538070 is 7083579882.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28897538070.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 909187 + ... + 940433.

It is an arithmetic number, because the mean of its divisors is an integer number (1122115680).

Almost surely, 2^28897538070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28897538070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35907701760).

28897538070 is an abundant number, since it is smaller than the sum of its proper divisors (42917865450).

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

28897538070 is a wasteful number, since it uses less digits than its factorization.

28897538070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32349.

The product of its (nonzero) digits is 6773760, while the sum is 57.

The spelling of 28897538070 in words is "twenty-eight billion, eight hundred ninety-seven million, five hundred thirty-eight thousand, seventy".