87402639 has 8 divisors (see below), whose sum is σ = 118276480. Its totient is φ = 57398616.

The previous prime is 87402613. The next prime is 87402643. The reversal of 87402639 is 93620478.

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

It is not a de Polignac number, because 87402639 - 2⁹ = 87402127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87402597 and 87402606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87402239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217219 + ... + 217620.

It is an arithmetic number, because the mean of its divisors is an integer number (14784560).

Almost surely, 2^87402639 is an apocalyptic number.

87402639 is a deficient number, since it is larger than the sum of its proper divisors (30873841).

87402639 is a wasteful number, since it uses less digits than its factorization.

87402639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434909.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 87402639 is about 9348.9378541094. The cubic root of 87402639 is about 443.7872783865.

The spelling of 87402639 in words is "eighty-seven million, four hundred two thousand, six hundred thirty-nine".