648715881 has 16 divisors (see below), whose sum is σ = 944379648. Its totient is φ = 392830800.

The previous prime is 648715871. The next prime is 648715891. The reversal of 648715881 is 188517846.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (648715871) and next prime (648715891).

It is not a de Polignac number, because 648715881 - 2⁹ = 648715369 is a prime.

It is a super-2 number, since 2×648715881² = 841664588523212322, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 648715881.

It is not an unprimeable number, because it can be changed into a prime (648715811) 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, 34990 + ... + 50216.

It is an arithmetic number, because the mean of its divisors is an integer number (59023728).

Almost surely, 2^648715881 is an apocalyptic number.

It is an amenable number.

648715881 is a deficient number, since it is larger than the sum of its proper divisors (295663767).

648715881 is a wasteful number, since it uses less digits than its factorization.

648715881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16532.

The product of its digits is 430080, while the sum is 48.

The square root of 648715881 is about 25469.9014721298. The cubic root of 648715881 is about 865.6682912850.

The spelling of 648715881 in words is "six hundred forty-eight million, seven hundred fifteen thousand, eight hundred eighty-one".