87720771 has 8 divisors (see below), whose sum is σ = 119813904. Its totient is φ = 57054080.

The previous prime is 87720769. The next prime is 87720797. The reversal of 87720771 is 17702778.

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

It is a cyclic number.

It is not a de Polignac number, because 87720771 - 2¹ = 87720769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87720071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356466 + ... + 356711.

It is an arithmetic number, because the mean of its divisors is an integer number (14976738).

Almost surely, 2^87720771 is an apocalyptic number.

87720771 is a deficient number, since it is larger than the sum of its proper divisors (32093133).

87720771 is a wasteful number, since it uses less digits than its factorization.

87720771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713221.

The product of its (nonzero) digits is 38416, while the sum is 39.

The square root of 87720771 is about 9365.9367390561. The cubic root of 87720771 is about 444.3250652961.

The spelling of 87720771 in words is "eighty-seven million, seven hundred twenty thousand, seven hundred seventy-one".