387280640 has 36 divisors (see below), whose sum is σ = 927661224. Its totient is φ = 154911744.

The previous prime is 387280639. The next prime is 387280657. The reversal of 387280640 is 46082783.

It is a junction number, because it is equal to n+sod(n) for n = 387280594 and 387280603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150002 + ... + 152561.

Almost surely, 2^387280640 is an apocalyptic number.

It is an amenable number.

387280640 is an abundant number, since it is smaller than the sum of its proper divisors (540380584).

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

387280640 is an equidigital number, since it uses as much as digits as its factorization.

387280640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302584 (or 302570 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 387280640 is about 19679.4471467061. The cubic root of 387280640 is about 728.9122725880.

The spelling of 387280640 in words is "three hundred eighty-seven million, two hundred eighty thousand, six hundred forty".