387667780 has 24 divisors (see below), whose sum is σ = 817490520. Its totient is φ = 154421760.

The previous prime is 387667727. The next prime is 387667781. The reversal of 387667780 is 87766783.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15872256 + 371795524 = 3984^2 + 19282^2 .

It is not an unprimeable number, because it can be changed into a prime (387667781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35395 + ... + 45034.

It is an arithmetic number, because the mean of its divisors is an integer number (34062105).

Almost surely, 2^387667780 is an apocalyptic number.

It is an amenable number.

387667780 is an abundant number, since it is smaller than the sum of its proper divisors (429822740).

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

387667780 is a wasteful number, since it uses less digits than its factorization.

387667780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80679 (or 80677 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 52.

The square root of 387667780 is about 19689.2808400916. The cubic root of 387667780 is about 729.1550742248.

The spelling of 387667780 in words is "three hundred eighty-seven million, six hundred sixty-seven thousand, seven hundred eighty".