649281360 has 480 divisors, whose sum is σ = 2621832192. Its totient is φ = 131604480.

The previous prime is 649281349. The next prime is 649281383. The reversal of 649281360 is 63182946.

It is a Cunningham number, because it is equal to 25481²-1.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4739212 + ... + 4739348.

Almost surely, 2^649281360 is an apocalyptic number.

649281360 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649281360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1310916096).

649281360 is an abundant number, since it is smaller than the sum of its proper divisors (1972550832).

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

649281360 is a wasteful number, since it uses less digits than its factorization.

649281360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 649281360 is about 25480.9999803775. Note that the first 4 decimals coincide. The cubic root of 649281360 is about 865.9197496338.

The spelling of 649281360 in words is "six hundred forty-nine million, two hundred eighty-one thousand, three hundred sixty".