102665540 has 12 divisors (see below), whose sum is σ = 215597676. Its totient is φ = 41066208.

The previous prime is 102665513. The next prime is 102665561. The reversal of 102665540 is 45566201.

It can be written as a sum of positive squares in 2 ways, for example, as 65674816 + 36990724 = 8104^2 + 6082^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2566619 + ... + 2566658.

It is an arithmetic number, because the mean of its divisors is an integer number (17966473).

Almost surely, 2^102665540 is an apocalyptic number.

102665540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102665540 is an abundant number, since it is smaller than the sum of its proper divisors (112932136).

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

102665540 is a wasteful number, since it uses less digits than its factorization.

102665540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5133286 (or 5133284 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 102665540 is about 10132.4005053097. The cubic root of 102665540 is about 468.2468868051.

It can be divided in two parts, 1026 and 65540, that added together give a palindrome (66566).

The spelling of 102665540 in words is "one hundred two million, six hundred sixty-five thousand, five hundred forty".