387828720 has 60 divisors (see below), whose sum is σ = 1302460536. Its totient is φ = 103420800.

The previous prime is 387828647. The next prime is 387828751. The reversal of 387828720 is 27828783.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×387828720² = 300822232113676800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 268606 + ... + 270045.

Almost surely, 2^387828720 is an apocalyptic number.

387828720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

387828720 is an abundant number, since it is smaller than the sum of its proper divisors (914631816).

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

387828720 is a wasteful number, since it uses less digits than its factorization.

387828720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538670 (or 538661 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The square root of 387828720 is about 19693.3674113901. The cubic root of 387828720 is about 729.2559629996.

The spelling of 387828720 in words is "three hundred eighty-seven million, eight hundred twenty-eight thousand, seven hundred twenty".