381645632 has 14 divisors (see below), whose sum is σ = 757328178. Its totient is φ = 190822784.

The previous prime is 381645623. The next prime is 381645643. The reversal of 381645632 is 236546183.

It can be written as a sum of positive squares in only one way, i.e., 280361536 + 101284096 = 16744^2 + 10064^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2981543 + ... + 2981670.

Almost surely, 2^381645632 is an apocalyptic number.

381645632 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

381645632 is a deficient number, since it is larger than the sum of its proper divisors (375682546).

381645632 is an equidigital number, since it uses as much as digits as its factorization.

381645632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5963225 (or 5963215 counting only the distinct ones).

The product of its digits is 103680, while the sum is 38.

The square root of 381645632 is about 19535.7526601869. The cubic root of 381645632 is about 725.3597149550.

The spelling of 381645632 in words is "three hundred eighty-one million, six hundred forty-five thousand, six hundred thirty-two".