648931340 has 12 divisors (see below), whose sum is σ = 1362755856. Its totient is φ = 259572528.

The previous prime is 648931337. The next prime is 648931343. The reversal of 648931340 is 43139846.

It is an interprime number because it is at equal distance from previous prime (648931337) and next prime (648931343).

It is a super-2 number, since 2×648931340² = 842223768068391200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 648931294 and 648931303.

It is not an unprimeable number, because it can be changed into a prime (648931343) 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, 16223264 + ... + 16223303.

It is an arithmetic number, because the mean of its divisors is an integer number (113562988).

Almost surely, 2^648931340 is an apocalyptic number.

It is an amenable number.

648931340 is an abundant number, since it is smaller than the sum of its proper divisors (713824516).

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

648931340 is a wasteful number, since it uses less digits than its factorization.

648931340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32446576 (or 32446574 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 648931340 is about 25474.1307996956. The cubic root of 648931340 is about 865.7641192555.

The spelling of 648931340 in words is "six hundred forty-eight million, nine hundred thirty-one thousand, three hundred forty".