649917772 has 48 divisors (see below), whose sum is σ = 1331545600. Its totient is φ = 277448976.

The previous prime is 649917767. The next prime is 649917787. The reversal of 649917772 is 277719946.

It is a super-2 number, since 2×649917772² = 844786220722887968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 420433 + ... + 421975.

Almost surely, 2^649917772 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649917772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (665772800).

649917772 is an abundant number, since it is smaller than the sum of its proper divisors (681627828).

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

649917772 is a wasteful number, since it uses less digits than its factorization.

649917772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875 (or 1859 counting only the distinct ones).

The product of its digits is 1333584, while the sum is 52.

The square root of 649917772 is about 25493.4848932036. The cubic root of 649917772 is about 866.2025760522.

The spelling of 649917772 in words is "six hundred forty-nine million, nine hundred seventeen thousand, seven hundred seventy-two".