87450639 has 4 divisors (see below), whose sum is σ = 116600856. Its totient is φ = 58300424.

The previous prime is 87450619. The next prime is 87450661. The reversal of 87450639 is 93605478.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 87450639 - 2⁵ = 87450607 is a prime.

It is a super-2 number, since 2×87450639² = 15295228523016642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87450639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87450619) 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 3 ways as a sum of consecutive naturals, for example, 14575104 + ... + 14575109.

It is an arithmetic number, because the mean of its divisors is an integer number (29150214).

Almost surely, 2^87450639 is an apocalyptic number.

87450639 is a deficient number, since it is larger than the sum of its proper divisors (29150217).

87450639 is a wasteful number, since it uses less digits than its factorization.

87450639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29150216.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 87450639 is about 9351.5046382922. The cubic root of 87450639 is about 443.8685035885.

The spelling of 87450639 in words is "eighty-seven million, four hundred fifty thousand, six hundred thirty-nine".