87128434 has 8 divisors (see below), whose sum is σ = 138380508. Its totient is φ = 41001600.

The previous prime is 87128423. The next prime is 87128443. The reversal of 87128434 is 43482178.

It can be written as a sum of positive squares in 2 ways, for example, as 66471409 + 20657025 = 8153^2 + 4545^2 .

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

It is a super-2 number, since 2×87128434² = 15182728022584712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87128393 and 87128402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1281267 + ... + 1281334.

Almost surely, 2^87128434 is an apocalyptic number.

87128434 is a deficient number, since it is larger than the sum of its proper divisors (51252074).

87128434 is a wasteful number, since it uses less digits than its factorization.

87128434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562620.

The product of its digits is 43008, while the sum is 37.

The square root of 87128434 is about 9334.2612991066. The cubic root of 87128434 is about 443.3226998536.

The spelling of 87128434 in words is "eighty-seven million, one hundred twenty-eight thousand, four hundred thirty-four".