387771720 has 128 divisors (see below), whose sum is σ = 1387376640. Its totient is φ = 84775680.

The previous prime is 387771719. The next prime is 387771749. The reversal of 387771720 is 27177783.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9285 + ... + 29355.

It is an arithmetic number, because the mean of its divisors is an integer number (10838880).

Almost surely, 2^387771720 is an apocalyptic number.

387771720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 387771720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (693688320).

387771720 is an abundant number, since it is smaller than the sum of its proper divisors (999604920).

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

387771720 is a wasteful number, since it uses less digits than its factorization.

387771720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20115 (or 20111 counting only the distinct ones).

The product of its (nonzero) digits is 115248, while the sum is 42.

The square root of 387771720 is about 19691.9201704659. The cubic root of 387771720 is about 729.2202344900.

The spelling of 387771720 in words is "three hundred eighty-seven million, seven hundred seventy-one thousand, seven hundred twenty".