87431042 has 4 divisors (see below), whose sum is σ = 131146566. Its totient is φ = 43715520.

The previous prime is 87431041. The next prime is 87431063. The reversal of 87431042 is 24013478.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 83740801 + 3690241 = 9151^2 + 1921^2 .

It is a junction number, because it is equal to n+sod(n) for n = 87430996 and 87431014.

It is not an unprimeable number, because it can be changed into a prime (87431041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21857759 + ... + 21857762.

Almost surely, 2^87431042 is an apocalyptic number.

87431042 is a deficient number, since it is larger than the sum of its proper divisors (43715524).

87431042 is a wasteful number, since it uses less digits than its factorization.

87431042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43715523.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 87431042 is about 9350.4567802862. The cubic root of 87431042 is about 443.8353452987.

The spelling of 87431042 in words is "eighty-seven million, four hundred thirty-one thousand, forty-two".