87469831 has 4 divisors (see below), whose sum is σ = 87845472. Its totient is φ = 87094192.

The previous prime is 87469751. The next prime is 87469843. The reversal of 87469831 is 13896478.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13896478 = 2 ⋅6948239.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87469831 is a prime.

It is a super-2 number, since 2×87469831² = 15301942670337122, 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 (87469861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187471 + ... + 187936.

It is an arithmetic number, because the mean of its divisors is an integer number (21961368).

Almost surely, 2^87469831 is an apocalyptic number.

87469831 is a deficient number, since it is larger than the sum of its proper divisors (375641).

87469831 is a wasteful number, since it uses less digits than its factorization.

87469831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375640.

The product of its digits is 290304, while the sum is 46.

The square root of 87469831 is about 9352.5307270278. The cubic root of 87469831 is about 443.9009718141.

The spelling of 87469831 in words is "eighty-seven million, four hundred sixty-nine thousand, eight hundred thirty-one".