3765720641 has 4 divisors (see below), whose sum is σ = 3765846192. Its totient is φ = 3765595092.

The previous prime is 3765720631. The next prime is 3765720653. The reversal of 3765720641 is 1460275673.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3765720641 - 2⁶ = 3765720577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3765720611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11546 + ... + 87548.

It is an arithmetic number, because the mean of its divisors is an integer number (941461548).

Almost surely, 2^3765720641 is an apocalyptic number.

It is an amenable number.

3765720641 is a deficient number, since it is larger than the sum of its proper divisors (125551).

3765720641 is an equidigital number, since it uses as much as digits as its factorization.

3765720641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125550.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 3765720641 is about 61365.4678218948. The cubic root of 3765720641 is about 1555.7842345759.

The spelling of 3765720641 in words is "three billion, seven hundred sixty-five million, seven hundred twenty thousand, six hundred forty-one".