84140640 has 96 divisors (see below), whose sum is σ = 294507360. Its totient is φ = 22436352.

The previous prime is 84140621. The next prime is 84140659. The reversal of 84140640 is 4604148.

84140640 is a `hidden beast` number, since 8 + 4 + 14 + 0 + 640 = 666.

It is an interprime number because it is at equal distance from previous prime (84140621) and next prime (84140659).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5419 + ... + 14058.

It is an arithmetic number, because the mean of its divisors is an integer number (3067785).

Almost surely, 2^84140640 is an apocalyptic number.

84140640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

84140640 is an abundant number, since it is smaller than the sum of its proper divisors (210366720).

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

84140640 is a wasteful number, since it uses less digits than its factorization.

84140640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19501 (or 19487 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 84140640 is about 9172.8207221116. The cubic root of 84140640 is about 438.1961965842.

Adding to 84140640 its reverse (4604148), we get a palindrome (88744788).

The spelling of 84140640 in words is "eighty-four million, one hundred forty thousand, six hundred forty".