102128640 has 176 divisors, whose sum is σ = 335052960. Its totient is φ = 26542080.

The previous prime is 102128627. The next prime is 102128651. The reversal of 102128640 is 46821201.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 102128640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 936906 + ... + 937014.

It is an arithmetic number, because the mean of its divisors is an integer number (1903710).

Almost surely, 2^102128640 is an apocalyptic number.

102128640 is a gapful number since it is divisible by the number (10) 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 102128640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167526480).

102128640 is an abundant number, since it is smaller than the sum of its proper divisors (232924320).

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

102128640 is a wasteful number, since it uses less digits than its factorization.

102128640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 102128640 is about 10105.8715606325. The cubic root of 102128640 is about 467.4292113546.

Adding to 102128640 its reverse (46821201), we get a palindrome (148949841).

The spelling of 102128640 in words is "one hundred two million, one hundred twenty-eight thousand, six hundred forty".