84072540 has 48 divisors (see below), whose sum is σ = 236009088. Its totient is φ = 22361664.

The previous prime is 84072539. The next prime is 84072553. The reversal of 84072540 is 4527048.

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 = 84072498 and 84072507.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24999 + ... + 28161.

It is an arithmetic number, because the mean of its divisors is an integer number (4916856).

Almost surely, 2^84072540 is an apocalyptic number.

It is an amenable number.

84072540 is an abundant number, since it is smaller than the sum of its proper divisors (151936548).

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

84072540 is a wasteful number, since it uses less digits than its factorization.

84072540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3618 (or 3616 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 84072540 is about 9169.1079173494. The cubic root of 84072540 is about 438.0779453034.

Adding to 84072540 its reverse (4527048), we get a palindrome (88599588).

The spelling of 84072540 in words is "eighty-four million, seventy-two thousand, five hundred forty".