1578720 has 192 divisors, whose sum is σ = 6096384. Its totient is φ = 337920.

The previous prime is 1578719. The next prime is 1578727. The reversal of 1578720 is 278751.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1578727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68629 + ... + 68651.

It is an arithmetic number, because the mean of its divisors is an integer number (31752).

2^1578720 is an apocalyptic number.

1578720 is a gapful number since it is divisible by the number (10) 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 1578720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3048192).

1578720 is an abundant number, since it is smaller than the sum of its proper divisors (4517664).

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

1578720 is a wasteful number, since it uses less digits than its factorization.

1578720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 1578720 is about 1256.4712491737. The cubic root of 1578720 is about 116.4398677809.

The spelling of 1578720 in words is "one million, five hundred seventy-eight thousand, seven hundred twenty".