87172142 has 4 divisors (see below), whose sum is σ = 130758216. Its totient is φ = 43586070.

The previous prime is 87172123. The next prime is 87172181. The reversal of 87172142 is 24127178.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 87172099 and 87172108.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 21793034 + ... + 21793037.

It is an arithmetic number, because the mean of its divisors is an integer number (32689554).

Almost surely, 2^87172142 is an apocalyptic number.

87172142 is a deficient number, since it is larger than the sum of its proper divisors (43586074).

87172142 is a wasteful number, since it uses less digits than its factorization.

87172142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43586073.

The product of its digits is 6272, while the sum is 32.

The square root of 87172142 is about 9336.6022727757. The cubic root of 87172142 is about 443.3968184410.

The spelling of 87172142 in words is "eighty-seven million, one hundred seventy-two thousand, one hundred forty-two".