648002478 has 8 divisors (see below), whose sum is σ = 1296004968. Its totient is φ = 216000824.

The previous prime is 648002473. The next prime is 648002479. The reversal of 648002478 is 874200846.

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

648002478 is an admirable number.

It is a super-2 number, since 2×648002478² = 839814422988280968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648002471) 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, 54000201 + ... + 54000212.

It is an arithmetic number, because the mean of its divisors is an integer number (162000621).

Almost surely, 2^648002478 is an apocalyptic number.

648002478 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648002478 is a wasteful number, since it uses less digits than its factorization.

648002478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108000418.

The product of its (nonzero) digits is 86016, while the sum is 39.

The square root of 648002478 is about 25455.8927951860. The cubic root of 648002478 is about 865.3508452369.

The spelling of 648002478 in words is "six hundred forty-eight million, two thousand, four hundred seventy-eight".