87128738 has 8 divisors (see below), whose sum is σ = 136375488. Its totient is φ = 41670244.

The previous prime is 87128687. The next prime is 87128753. The reversal of 87128738 is 83782178.

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

It is a Curzon number.

It is an unprimeable number.

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, 947006 + ... + 947097.

It is an arithmetic number, because the mean of its divisors is an integer number (17046936).

Almost surely, 2^87128738 is an apocalyptic number.

87128738 is a deficient number, since it is larger than the sum of its proper divisors (49246750).

87128738 is a wasteful number, since it uses less digits than its factorization.

87128738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894128.

The product of its digits is 150528, while the sum is 44.

The square root of 87128738 is about 9334.2775831877. The cubic root of 87128738 is about 443.3232154524.

The spelling of 87128738 in words is "eighty-seven million, one hundred twenty-eight thousand, seven hundred thirty-eight".