381491677840 has 160 divisors (see below), whose sum is σ = 1149108952320. Its totient is φ = 114381268992.

The previous prime is 381491677817. The next prime is 381491677841. The reversal of 381491677840 is 48776194183.

It is a happy number.

It is a super-2 number, since 2×381491677840² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (381491677841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1240699 + ... + 1517338.

It is an arithmetic number, because the mean of its divisors is an integer number (7181930952).

Almost surely, 2^381491677840 is an apocalyptic number.

It is an amenable number.

381491677840 is an abundant number, since it is smaller than the sum of its proper divisors (767617274480).

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

381491677840 is a wasteful number, since it uses less digits than its factorization.

381491677840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758089 (or 2758083 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 58.

The spelling of 381491677840 in words is "three hundred eighty-one billion, four hundred ninety-one million, six hundred seventy-seven thousand, eight hundred forty".