87628921408 has 28 divisors (see below), whose sum is σ = 198729876352. Its totient is φ = 37555251840.

The previous prime is 87628921379. The next prime is 87628921417. The reversal of 87628921408 is 80412982678.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (28).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97799688 + ... + 97800583.

It is an arithmetic number, because the mean of its divisors is an integer number (7097495584).

Almost surely, 2^87628921408 is an apocalyptic number.

It is an amenable number.

87628921408 is an abundant number, since it is smaller than the sum of its proper divisors (111100954944).

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

87628921408 is a wasteful number, since it uses less digits than its factorization.

87628921408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195600290 (or 195600280 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 55.

The spelling of 87628921408 in words is "eighty-seven billion, six hundred twenty-eight million, nine hundred twenty-one thousand, four hundred eight".