140305664 has 18 divisors (see below), whose sum is σ = 280063770. Its totient is φ = 70152704.

The previous prime is 140305661. The next prime is 140305699. The reversal of 140305664 is 466503041.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 139051264 + 1254400 = 11792^2 + 1120^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140305661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 273779 + ... + 274290.

Almost surely, 2^140305664 is an apocalyptic number.

It is an amenable number.

140305664 is a deficient number, since it is larger than the sum of its proper divisors (139758106).

140305664 is an frugal number, since it uses more digits than its factorization.

140305664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548085 (or 548071 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 140305664 is about 11845.0691851082. The cubic root of 140305664 is about 519.6270303821.

The spelling of 140305664 in words is "one hundred forty million, three hundred five thousand, six hundred sixty-four".