102655440 has 120 divisors (see below), whose sum is σ = 359798400. Its totient is φ = 26180352.

The previous prime is 102655403. The next prime is 102655451. The reversal of 102655440 is 44556201.

102655440 is a `hidden beast` number, since 1 + 0 + 2 + 655 + 4 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13461 + ... + 19659.

It is an arithmetic number, because the mean of its divisors is an integer number (2998320).

Almost surely, 2^102655440 is an apocalyptic number.

102655440 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 102655440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179899200).

102655440 is an abundant number, since it is smaller than the sum of its proper divisors (257142960).

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

102655440 is a wasteful number, since it uses less digits than its factorization.

102655440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6241 (or 6232 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 102655440 is about 10131.9020919075. The cubic root of 102655440 is about 468.2315312838.

The spelling of 102655440 in words is "one hundred two million, six hundred fifty-five thousand, four hundred forty".