381499664031828 has 48 divisors (see below), whose sum is σ = 989074764034560. Its totient is φ = 127166353978752.

The previous prime is 381499664031823. The next prime is 381499664031833. The reversal of 381499664031828 is 828130466994183.

381499664031828 is a `hidden beast` number, since 3 + 8 + 1 + 499 + 66 + 40 + 3 + 18 + 28 = 666.

It is an interprime number because it is at equal distance from previous prime (381499664031823) and next prime (381499664031833).

It is a super-2 number, since 2×381499664031828² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381499664031823) 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, 76301100 + ... + 81147132.

It is an arithmetic number, because the mean of its divisors is an integer number (20605724250720).

Almost surely, 2^{381499664031828} is an apocalyptic number.

It is an amenable number.

381499664031828 is an abundant number, since it is smaller than the sum of its proper divisors (607575100002732).

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

381499664031828 is a wasteful number, since it uses less digits than its factorization.

381499664031828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5574973 (or 5574965 counting only the distinct ones).

The product of its (nonzero) digits is 429981696, while the sum is 72.

The spelling of 381499664031828 in words is "three hundred eighty-one trillion, four hundred ninety-nine billion, six hundred sixty-four million, thirty-one thousand, eight hundred twenty-eight".