5721978 has 16 divisors (see below), whose sum is σ = 11506176. Its totient is φ = 1896960.

The previous prime is 5721971. The next prime is 5722007. The reversal of 5721978 is 8791275.

It is not an unprimeable number, because it can be changed into a prime (5721971) 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, 1351 + ... + 3642.

It is an arithmetic number, because the mean of its divisors is an integer number (719136).

Almost surely, 2^5721978 is an apocalyptic number.

5721978 is an abundant number, since it is smaller than the sum of its proper divisors (5784198).

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

5721978 is a wasteful number, since it uses less digits than its factorization.

5721978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5189.

The product of its digits is 35280, while the sum is 39.

The square root of 5721978 is about 2392.0656345510. The cubic root of 5721978 is about 178.8608929322.

The spelling of 5721978 in words is "five million, seven hundred twenty-one thousand, nine hundred seventy-eight".