649781427 has 16 divisors (see below), whose sum is σ = 873934848. Its totient is φ = 429424320.

The previous prime is 649781417. The next prime is 649781449. The reversal of 649781427 is 724187946.

It is not a de Polignac number, because 649781427 - 2¹⁹ = 649257139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (649781417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177538 + ... + 181160.

It is an arithmetic number, because the mean of its divisors is an integer number (54620928).

Almost surely, 2^649781427 is an apocalyptic number.

649781427 is a deficient number, since it is larger than the sum of its proper divisors (224153421).

649781427 is a wasteful number, since it uses less digits than its factorization.

649781427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4130.

The product of its digits is 677376, while the sum is 48.

The square root of 649781427 is about 25490.8106383457. The cubic root of 649781427 is about 866.1419988248.

The spelling of 649781427 in words is "six hundred forty-nine million, seven hundred eighty-one thousand, four hundred twenty-seven".