87456421 has 4 divisors (see below), whose sum is σ = 94183852. Its totient is φ = 80728992.

The previous prime is 87456407. The next prime is 87456427. The reversal of 87456421 is 12465478.

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

It can be written as a sum of positive squares in 2 ways, for example, as 51624225 + 35832196 = 7185^2 + 5986^2 .

It is a cyclic number.

It is not a de Polignac number, because 87456421 - 2⁵ = 87456389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87456427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3363696 + ... + 3363721.

It is an arithmetic number, because the mean of its divisors is an integer number (23545963).

Almost surely, 2^87456421 is an apocalyptic number.

It is an amenable number.

87456421 is a deficient number, since it is larger than the sum of its proper divisors (6727431).

87456421 is a wasteful number, since it uses less digits than its factorization.

87456421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6727430.

The product of its digits is 53760, while the sum is 37.

The square root of 87456421 is about 9351.8137812940. The cubic root of 87456421 is about 443.8782858350.

The spelling of 87456421 in words is "eighty-seven million, four hundred fifty-six thousand, four hundred twenty-one".