140640645 has 32 divisors (see below), whose sum is σ = 233938944. Its totient is φ = 72072000.

The previous prime is 140640637. The next prime is 140640649. The reversal of 140640645 is 546046041.

It is not a de Polignac number, because 140640645 - 2³ = 140640637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140640649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69214 + ... + 71216.

It is an arithmetic number, because the mean of its divisors is an integer number (7310592).

Almost surely, 2^140640645 is an apocalyptic number.

140640645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

140640645 is a deficient number, since it is larger than the sum of its proper divisors (93298299).

140640645 is a wasteful number, since it uses less digits than its factorization.

140640645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 140640645 is about 11859.2008584053. The cubic root of 140640645 is about 520.0402397361.

Adding to 140640645 its reverse (546046041), we get a palindrome (686686686).

The spelling of 140640645 in words is "one hundred forty million, six hundred forty thousand, six hundred forty-five".