646774148 has 6 divisors (see below), whose sum is σ = 1131854766. Its totient is φ = 323387072.

The previous prime is 646774147. The next prime is 646774151. The reversal of 646774148 is 841477646.

646774148 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 510398464 + 136375684 = 22592^2 + 11678^2 .

It is a super-2 number, since 2×646774148² = 836633597042251808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646774147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80846765 + ... + 80846772.

It is an arithmetic number, because the mean of its divisors is an integer number (188642461).

Almost surely, 2^646774148 is an apocalyptic number.

It is an amenable number.

646774148 is a deficient number, since it is larger than the sum of its proper divisors (485080618).

646774148 is a wasteful number, since it uses less digits than its factorization.

646774148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161693541 (or 161693539 counting only the distinct ones).

The product of its digits is 903168, while the sum is 47.

The square root of 646774148 is about 25431.7547172821. The cubic root of 646774148 is about 864.8037234952.

The spelling of 646774148 in words is "six hundred forty-six million, seven hundred seventy-four thousand, one hundred forty-eight".