648156978 has 80 divisors (see below), whose sum is σ = 1695285504. Its totient is φ = 181232640.

The previous prime is 648156973. The next prime is 648156983. The reversal of 648156978 is 879651846.

648156978 is a `hidden beast` number, since 6 + 4 + 8 + 1 + 569 + 78 = 666.

It is an interprime number because it is at equal distance from previous prime (648156973) and next prime (648156983).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (648156973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 47218 + ... + 59378.

Almost surely, 2^648156978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648156978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (847642752).

648156978 is an abundant number, since it is smaller than the sum of its proper divisors (1047128526).

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

648156978 is a wasteful number, since it uses less digits than its factorization.

648156978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12229 (or 12220 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 648156978 is about 25458.9272751230. The cubic root of 648156978 is about 865.4196135343.

The spelling of 648156978 in words is "six hundred forty-eight million, one hundred fifty-six thousand, nine hundred seventy-eight".