648684079 has 4 divisors (see below), whose sum is σ = 686841984. Its totient is φ = 610526176.

The previous prime is 648684041. The next prime is 648684103. The reversal of 648684079 is 970486846.

It is a happy number.

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 648684079 - 2⁷ = 648683951 is a prime.

It is a super-3 number, since 3×648684079³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648684679) 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, 19078927 + ... + 19078960.

It is an arithmetic number, because the mean of its divisors is an integer number (171710496).

Almost surely, 2^648684079 is an apocalyptic number.

648684079 is a deficient number, since it is larger than the sum of its proper divisors (38157905).

648684079 is a wasteful number, since it uses less digits than its factorization.

648684079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38157904.

The product of its (nonzero) digits is 2322432, while the sum is 52.

The square root of 648684079 is about 25469.2771589615. The cubic root of 648684079 is about 865.6541451677.

The spelling of 648684079 in words is "six hundred forty-eight million, six hundred eighty-four thousand, seventy-nine".