387781020 has 240 divisors, whose sum is σ = 1358235648. Its totient is φ = 91808640.

The previous prime is 387780977. The next prime is 387781027. The reversal of 387781020 is 20187783.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387781027) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 837309 + ... + 837771.

Almost surely, 2^387781020 is an apocalyptic number.

387781020 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 387781020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (679117824).

387781020 is an abundant number, since it is smaller than the sum of its proper divisors (970454628).

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

387781020 is a wasteful number, since it uses less digits than its factorization.

387781020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 387781020 is about 19692.1563065095. The cubic root of 387781020 is about 729.2260641174.

The spelling of 387781020 in words is "three hundred eighty-seven million, seven hundred eighty-one thousand, twenty".