102857840 has 40 divisors (see below), whose sum is σ = 249546528. Its totient is φ = 39353600.

The previous prime is 102857831. The next prime is 102857857. The reversal of 102857840 is 48758201.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 102857840.

It is a congruent number.

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, 26111 + ... + 29790.

Almost surely, 2^102857840 is an apocalyptic number.

102857840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102857840 is an abundant number, since it is smaller than the sum of its proper divisors (146688688).

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

102857840 is a wasteful number, since it uses less digits than its factorization.

102857840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55937 (or 55931 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 102857840 is about 10141.8854262903. The cubic root of 102857840 is about 468.5390579179.

The spelling of 102857840 in words is "one hundred two million, eight hundred fifty-seven thousand, eight hundred forty".