648015979 has 16 divisors (see below), whose sum is σ = 743087520. Its totient is φ = 559802880.

The previous prime is 648015967. The next prime is 648015989. The reversal of 648015979 is 979510846.

It is not a de Polignac number, because 648015979 - 2¹¹ = 648013931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648015959) 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, 31369 + ... + 47749.

It is an arithmetic number, because the mean of its divisors is an integer number (46442970).

Almost surely, 2^648015979 is an apocalyptic number.

648015979 is a deficient number, since it is larger than the sum of its proper divisors (95071541).

648015979 is a wasteful number, since it uses less digits than its factorization.

648015979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16590.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 648015979 is about 25456.1579779825. The cubic root of 648015979 is about 865.3568549982.

The spelling of 648015979 in words is "six hundred forty-eight million, fifteen thousand, nine hundred seventy-nine".