102845640 has 32 divisors (see below), whose sum is σ = 308537280. Its totient is φ = 27425472.

The previous prime is 102845621. The next prime is 102845653. The reversal of 102845640 is 46548201.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 102845598 and 102845607.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428404 + ... + 428643.

It is an arithmetic number, because the mean of its divisors is an integer number (9641790).

Almost surely, 2^102845640 is an apocalyptic number.

102845640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102845640 is an abundant number, since it is smaller than the sum of its proper divisors (205691640).

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

102845640 is a wasteful number, since it uses less digits than its factorization.

102845640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857061 (or 857057 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 102845640 is about 10141.2839423813. The cubic root of 102845640 is about 468.5205326649.

The spelling of 102845640 in words is "one hundred two million, eight hundred forty-five thousand, six hundred forty".