87724747 has 4 divisors (see below), whose sum is σ = 95699736. Its totient is φ = 79749760.

The previous prime is 87724639. The next prime is 87724781. The reversal of 87724747 is 74742778.

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

It is a cyclic number.

It is not a de Polignac number, because 87724747 - 2⁷ = 87724619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87724697 and 87724706.

It is not an unprimeable number, because it can be changed into a prime (87727747) 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, 3987478 + ... + 3987499.

It is an arithmetic number, because the mean of its divisors is an integer number (23924934).

Almost surely, 2^87724747 is an apocalyptic number.

87724747 is a deficient number, since it is larger than the sum of its proper divisors (7974989).

87724747 is a wasteful number, since it uses less digits than its factorization.

87724747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7974988.

The product of its digits is 614656, while the sum is 46.

The square root of 87724747 is about 9366.1489951847. The cubic root of 87724747 is about 444.3317783005.

The spelling of 87724747 in words is "eighty-seven million, seven hundred twenty-four thousand, seven hundred forty-seven".