649047777 has 24 divisors (see below), whose sum is σ = 1065907296. Its totient is φ = 349066368.

The previous prime is 649047767. The next prime is 649047779. The reversal of 649047777 is 777740946.

It is not a de Polignac number, because 649047777 - 2⁴ = 649047761 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (649047779) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127363 + ... + 132360.

It is an arithmetic number, because the mean of its divisors is an integer number (44412804).

Almost surely, 2^649047777 is an apocalyptic number.

It is an amenable number.

649047777 is a deficient number, since it is larger than the sum of its proper divisors (416859519).

649047777 is a wasteful number, since it uses less digits than its factorization.

649047777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259757 (or 259750 counting only the distinct ones).

The product of its (nonzero) digits is 2074464, while the sum is 51.

The square root of 649047777 is about 25476.4160941055. The cubic root of 649047777 is about 865.8158971771.

The spelling of 649047777 in words is "six hundred forty-nine million, forty-seven thousand, seven hundred seventy-seven".