3640731378 has 32 divisors (see below), whose sum is σ = 7340004672. Its totient is φ = 1203854400.

The previous prime is 3640731377. The next prime is 3640731401. The reversal of 3640731378 is 8731370463.

It is not an unprimeable number, because it can be changed into a prime (3640731371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 453225 + ... + 461187.

It is an arithmetic number, because the mean of its divisors is an integer number (229375146).

Almost surely, 2^3640731378 is an apocalyptic number.

3640731378 is an abundant number, since it is smaller than the sum of its proper divisors (3699273294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3640731378 is a wasteful number, since it uses less digits than its factorization.

3640731378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8570.

The product of its (nonzero) digits is 254016, while the sum is 42.

The square root of 3640731378 is about 60338.4734477100. The cubic root of 3640731378 is about 1538.3773567698.

The spelling of 3640731378 in words is "three billion, six hundred forty million, seven hundred thirty-one thousand, three hundred seventy-eight".