87781842 has 24 divisors (see below), whose sum is σ = 191943180. Its totient is φ = 28991520.

The previous prime is 87781819. The next prime is 87781847. The reversal of 87781842 is 24818778.

It can be written as a sum of positive squares in 2 ways, for example, as 81920601 + 5861241 = 9051^2 + 2421^2 .

It is not an unprimeable number, because it can be changed into a prime (87781847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20409 + ... + 24332.

Almost surely, 2^87781842 is an apocalyptic number.

87781842 is an abundant number, since it is smaller than the sum of its proper divisors (104161338).

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

87781842 is a wasteful number, since it uses less digits than its factorization.

87781842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44858 (or 44855 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 87781842 is about 9369.1964436658. The cubic root of 87781842 is about 444.4281540742.

The spelling of 87781842 in words is "eighty-seven million, seven hundred eighty-one thousand, eight hundred forty-two".