649447956 has 60 divisors (see below), whose sum is σ = 1700216980. Its totient is φ = 216172800.

The previous prime is 649447943. The next prime is 649447969. The reversal of 649447956 is 659744946.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (649447943) and next prime (649447969).

It can be written as a sum of positive squares in 2 ways, for example, as 112784400 + 536663556 = 10620^2 + 23166^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 388290 + ... + 389958.

Almost surely, 2^649447956 is an apocalyptic number.

It is an amenable number.

649447956 is an abundant number, since it is smaller than the sum of its proper divisors (1050769024).

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

649447956 is a wasteful number, since it uses less digits than its factorization.

649447956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2886 (or 2875 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The square root of 649447956 is about 25484.2687946898. The cubic root of 649447956 is about 865.9938040366.

It can be divided in two parts, 64944 and 7956, that added together give a square (72900 = 270²).

The spelling of 649447956 in words is "six hundred forty-nine million, four hundred forty-seven thousand, nine hundred fifty-six".