102065840 has 20 divisors (see below), whose sum is σ = 237303264. Its totient is φ = 40826304.

The previous prime is 102065833. The next prime is 102065849. The reversal of 102065840 is 48560201.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (102065849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637832 + ... + 637991.

Almost surely, 2^102065840 is an apocalyptic number.

102065840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102065840 is an abundant number, since it is smaller than the sum of its proper divisors (135237424).

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

102065840 is a wasteful number, since it uses less digits than its factorization.

102065840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275836 (or 1275830 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 102065840 is about 10102.7639782388. The cubic root of 102065840 is about 467.3333826255. Note that the first 4 decimals are identical.

The spelling of 102065840 in words is "one hundred two million, sixty-five thousand, eight hundred forty".