87782731 has 4 divisors (see below), whose sum is σ = 90614464. Its totient is φ = 84951000.

The previous prime is 87782729. The next prime is 87782741. The reversal of 87782731 is 13728778.

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 87782731 - 2¹ = 87782729 is a prime.

It is a super-2 number, since 2×87782731² = 15411615723636722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87782701) 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, 1415820 + ... + 1415881.

It is an arithmetic number, because the mean of its divisors is an integer number (22653616).

Almost surely, 2^87782731 is an apocalyptic number.

87782731 is a deficient number, since it is larger than the sum of its proper divisors (2831733).

87782731 is a wasteful number, since it uses less digits than its factorization.

87782731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2831732.

The product of its digits is 131712, while the sum is 43.

The square root of 87782731 is about 9369.2438862482. The cubic root of 87782731 is about 444.4296543666.

The spelling of 87782731 in words is "eighty-seven million, seven hundred eighty-two thousand, seven hundred thirty-one".