387665670 has 64 divisors (see below), whose sum is σ = 1069355520. Its totient is φ = 88105728.

The previous prime is 387665647. The next prime is 387665689. The reversal of 387665670 is 76566783.

It is a Curzon number.

It is a congruent number.

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, 32434 + ... + 42746.

It is an arithmetic number, because the mean of its divisors is an integer number (16708680).

Almost surely, 2^387665670 is an apocalyptic number.

387665670 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 387665670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (534677760).

387665670 is an abundant number, since it is smaller than the sum of its proper divisors (681689850).

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

387665670 is a wasteful number, since it uses less digits than its factorization.

387665670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10509.

The product of its (nonzero) digits is 1270080, while the sum is 48.

The square root of 387665670 is about 19689.2272575640. The cubic root of 387665670 is about 729.1537513395.

The spelling of 387665670 in words is "three hundred eighty-seven million, six hundred sixty-five thousand, six hundred seventy".