87478031 has 4 divisors (see below), whose sum is σ = 87512064. Its totient is φ = 87444000.

The previous prime is 87478021. The next prime is 87478057. The reversal of 87478031 is 13087478.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13087478 = 2 ⋅6543739.

It is a cyclic number.

It is not a de Polignac number, because 87478031 - 2⁶ = 87477967 is a prime.

It is a super-3 number, since 3×87478031³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87478021) 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, 12815 + ... + 18416.

It is an arithmetic number, because the mean of its divisors is an integer number (21878016).

Almost surely, 2^87478031 is an apocalyptic number.

87478031 is a deficient number, since it is larger than the sum of its proper divisors (34033).

87478031 is a wasteful number, since it uses less digits than its factorization.

87478031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34032.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 87478031 is about 9352.9691007722. The cubic root of 87478031 is about 443.9148427841.

The spelling of 87478031 in words is "eighty-seven million, four hundred seventy-eight thousand, thirty-one".