87402638 has 4 divisors (see below), whose sum is σ = 131103960. Its totient is φ = 43701318.

The previous prime is 87402613. The next prime is 87402643. The reversal of 87402638 is 83620478.

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

It is a super-2 number, since 2×87402638² = 15278442258718088, which contains 22 as substring.

It is a congruent 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 as a sum of consecutive naturals, namely, 21850658 + ... + 21850661.

It is an arithmetic number, because the mean of its divisors is an integer number (32775990).

Almost surely, 2^87402638 is an apocalyptic number.

87402638 is a deficient number, since it is larger than the sum of its proper divisors (43701322).

87402638 is a wasteful number, since it uses less digits than its factorization.

87402638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43701321.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 87402638 is about 9348.9378006274. The cubic root of 87402638 is about 443.7872766940.

The spelling of 87402638 in words is "eighty-seven million, four hundred two thousand, six hundred thirty-eight".