387100728 has 64 divisors (see below), whose sum is σ = 1228896000. Its totient is φ = 110599776.

The previous prime is 387100691. The next prime is 387100739. The reversal of 387100728 is 827001783.

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

It is a junction number, because it is equal to n+sod(n) for n = 387100692 and 387100701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126498 + ... + 129521.

It is an arithmetic number, because the mean of its divisors is an integer number (19201500).

Almost surely, 2^387100728 is an apocalyptic number.

It is an amenable number.

387100728 is an abundant number, since it is smaller than the sum of its proper divisors (841795272).

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

387100728 is a wasteful number, since it uses less digits than its factorization.

387100728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256041 (or 256031 counting only the distinct ones).

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

The square root of 387100728 is about 19674.8755523383. The cubic root of 387100728 is about 728.7993825511.

The spelling of 387100728 in words is "three hundred eighty-seven million, one hundred thousand, seven hundred twenty-eight".