87720042 has 16 divisors (see below), whose sum is σ = 175790880. Its totient is φ = 29181552.

The previous prime is 87720023. The next prime is 87720047. The reversal of 87720042 is 24002778.

It is a junction number, because it is equal to n+sod(n) for n = 87719991 and 87720009.

It is not an unprimeable number, because it can be changed into a prime (87720047) 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, 11308 + ... + 17415.

It is an arithmetic number, because the mean of its divisors is an integer number (10986930).

Almost surely, 2^87720042 is an apocalyptic number.

87720042 is an abundant number, since it is smaller than the sum of its proper divisors (88070838).

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

87720042 is a wasteful number, since it uses less digits than its factorization.

87720042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29237.

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 87720042 is about 9365.8978213517. The cubic root of 87720042 is about 444.3238344440.

The spelling of 87720042 in words is "eighty-seven million, seven hundred twenty thousand, forty-two".