103665640 has 32 divisors (see below), whose sum is σ = 251191080. Its totient is φ = 38276352.

The previous prime is 103665637. The next prime is 103665641. The reversal of 103665640 is 46566301.

It can be written as a sum of positive squares in 4 ways, for example, as 93818596 + 9847044 = 9686^2 + 3138^2 .

It is not an unprimeable number, because it can be changed into a prime (103665641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99159 + ... + 100198.

Almost surely, 2^103665640 is an apocalyptic number.

103665640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

103665640 is an abundant number, since it is smaller than the sum of its proper divisors (147525440).

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

103665640 is a wasteful number, since it uses less digits than its factorization.

103665640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199381 (or 199377 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 103665640 is about 10181.6324820728. The cubic root of 103665640 is about 469.7624270888.

The spelling of 103665640 in words is "one hundred three million, six hundred sixty-five thousand, six hundred forty".