1240726664 has 8 divisors (see below), whose sum is σ = 2326362510. Its totient is φ = 620363328.

The previous prime is 1240726621. The next prime is 1240726673. The reversal of 1240726664 is 4666270421.

It can be written as a sum of positive squares in only one way, i.e., 1026689764 + 214036900 = 32042^2 + 14630^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 77545409 + ... + 77545424.

Almost surely, 2^1240726664 is an apocalyptic number.

It is an amenable number.

1240726664 is a deficient number, since it is larger than the sum of its proper divisors (1085635846).

1240726664 is a wasteful number, since it uses less digits than its factorization.

1240726664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155090839 (or 155090835 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 1240726664 is about 35223.9501475913. The cubic root of 1240726664 is about 1074.5468907806.

The spelling of 1240726664 in words is "one billion, two hundred forty million, seven hundred twenty-six thousand, six hundred sixty-four".