87720234 has 16 divisors (see below), whose sum is σ = 200503488. Its totient is φ = 25062912.

The previous prime is 87720179. The next prime is 87720239. The reversal of 87720234 is 43202778.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 87720195 and 87720204.

It is not an unprimeable number, because it can be changed into a prime (87720239) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1044247 + ... + 1044330.

It is an arithmetic number, because the mean of its divisors is an integer number (12531468).

Almost surely, 2^87720234 is an apocalyptic number.

87720234 is an abundant number, since it is smaller than the sum of its proper divisors (112783254).

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

87720234 is a wasteful number, since it uses less digits than its factorization.

87720234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088589.

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 87720234 is about 9365.9080712977. The cubic root of 87720234 is about 444.3241586197.

The spelling of 87720234 in words is "eighty-seven million, seven hundred twenty thousand, two hundred thirty-four".