87654721 has 16 divisors (see below), whose sum is σ = 110315520. Its totient is φ = 67657680.

The previous prime is 87654719. The next prime is 87654727. The reversal of 87654721 is 12745678.

It is a cyclic number.

It is not a de Polignac number, because 87654721 - 2¹ = 87654719 is a prime.

It is a super-2 number, since 2×87654721² = 15366700227175682, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (87654727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2920 + ... + 13558.

It is an arithmetic number, because the mean of its divisors is an integer number (6894720).

Almost surely, 2^87654721 is an apocalyptic number.

It is an amenable number.

87654721 is a deficient number, since it is larger than the sum of its proper divisors (22660799).

87654721 is a wasteful number, since it uses less digits than its factorization.

87654721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10764.

The product of its digits is 94080, while the sum is 40.

The square root of 87654721 is about 9362.4099995674. The cubic root of 87654721 is about 444.2135180188.

The spelling of 87654721 in words is "eighty-seven million, six hundred fifty-four thousand, seven hundred twenty-one".