3640981578 has 32 divisors (see below), whose sum is σ = 7844508672. Its totient is φ = 1119960000.

The previous prime is 3640981573. The next prime is 3640981583. The reversal of 3640981578 is 8751890463.

It is an interprime number because it is at equal distance from previous prime (3640981573) and next prime (3640981583).

It is a self number, because there is not a number n which added to its sum of digits gives 3640981578.

It is not an unprimeable number, because it can be changed into a prime (3640981573) 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, 393303 + ... + 402453.

It is an arithmetic number, because the mean of its divisors is an integer number (245140896).

Almost surely, 2^3640981578 is an apocalyptic number.

3640981578 is an abundant number, since it is smaller than the sum of its proper divisors (4203527094).

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

3640981578 is a wasteful number, since it uses less digits than its factorization.

3640981578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14270.

The product of its (nonzero) digits is 1451520, while the sum is 51.

The square root of 3640981578 is about 60340.5467161178. The cubic root of 3640981578 is about 1538.4125963191.

The spelling of 3640981578 in words is "three billion, six hundred forty million, nine hundred eighty-one thousand, five hundred seventy-eight".