649772120 has 32 divisors (see below), whose sum is σ = 1482585120. Its totient is φ = 256247040.

The previous prime is 649772111. The next prime is 649772129. The reversal of 649772120 is 21277946.

It is an interprime number because it is at equal distance from previous prime (649772111) and next prime (649772129).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649772129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111557 + ... + 117236.

It is an arithmetic number, because the mean of its divisors is an integer number (46330785).

Almost surely, 2^649772120 is an apocalyptic number.

It is an amenable number.

649772120 is an abundant number, since it is smaller than the sum of its proper divisors (832813000).

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

649772120 is a wasteful number, since it uses less digits than its factorization.

649772120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228875 (or 228871 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 649772120 is about 25490.6280817088. The cubic root of 649772120 is about 866.1378634742.

The spelling of 649772120 in words is "six hundred forty-nine million, seven hundred seventy-two thousand, one hundred twenty".