87851731 has 8 divisors (see below), whose sum is σ = 96205824. Its totient is φ = 79558920.

The previous prime is 87851707. The next prime is 87851747. The reversal of 87851731 is 13715878.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87851731 - 2¹¹ = 87849683 is a prime.

It is a super-2 number, since 2×87851731² = 15435853279392722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87851831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12291 + ... + 18076.

It is an arithmetic number, because the mean of its divisors is an integer number (12025728).

Almost surely, 2^87851731 is an apocalyptic number.

87851731 is a deficient number, since it is larger than the sum of its proper divisors (8354093).

87851731 is a wasteful number, since it uses less digits than its factorization.

87851731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30641.

The product of its digits is 47040, while the sum is 40.

The square root of 87851731 is about 9372.9254237938. The cubic root of 87851731 is about 444.5460691200.

The spelling of 87851731 in words is "eighty-seven million, eight hundred fifty-one thousand, seven hundred thirty-one".