84100720 has 40 divisors (see below), whose sum is σ = 213312240. Its totient is φ = 30581760.

The previous prime is 84100697. The next prime is 84100721. The reversal of 84100720 is 2700148.

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

It is a super-2 number, since 2×84100720² = 14145862209036800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 84100691 and 84100700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84100721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46905 + ... + 48664.

It is an arithmetic number, because the mean of its divisors is an integer number (5332806).

Almost surely, 2^84100720 is an apocalyptic number.

84100720 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

84100720 is an abundant number, since it is smaller than the sum of its proper divisors (129211520).

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

84100720 is a wasteful number, since it uses less digits than its factorization.

84100720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95593 (or 95587 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 84100720 is about 9170.6444702649. The cubic root of 84100720 is about 438.1268858075.

Adding to 84100720 its reverse (2700148), we get a palindrome (86800868).

The spelling of 84100720 in words is "eighty-four million, one hundred thousand, seven hundred twenty".