87422781 has 16 divisors (see below), whose sum is σ = 123492800. Its totient is φ = 54857088.

The previous prime is 87422779. The next prime is 87422861. The reversal of 87422781 is 18722478.

It is not a de Polignac number, because 87422781 - 2¹ = 87422779 is a prime.

It is a super-2 number, since 2×87422781² = 15285485275547922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87422761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4065 + ... + 13833.

It is an arithmetic number, because the mean of its divisors is an integer number (7718300).

Almost surely, 2^87422781 is an apocalyptic number.

It is an amenable number.

87422781 is a deficient number, since it is larger than the sum of its proper divisors (36070019).

87422781 is a wasteful number, since it uses less digits than its factorization.

87422781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9948.

The product of its digits is 50176, while the sum is 39.

The square root of 87422781 is about 9350.0150267259. The cubic root of 87422781 is about 443.8213661322.

The spelling of 87422781 in words is "eighty-seven million, four hundred twenty-two thousand, seven hundred eighty-one".