660728454 has 32 divisors (see below), whose sum is σ = 1374388224. Its totient is φ = 211589280.

The previous prime is 660728449. The next prime is 660728459. The reversal of 660728454 is 454827066.

660728454 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (660728449) and next prime (660728459).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660728459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5254 + ... + 36729.

It is an arithmetic number, because the mean of its divisors is an integer number (42949632).

Almost surely, 2^660728454 is an apocalyptic number.

660728454 is an abundant number, since it is smaller than the sum of its proper divisors (713659770).

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

660728454 is a wasteful number, since it uses less digits than its factorization.

660728454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42092.

The product of its (nonzero) digits is 322560, while the sum is 42.

The square root of 660728454 is about 25704.6387642386. The cubic root of 660728454 is about 870.9789719795.

The spelling of 660728454 in words is "six hundred sixty million, seven hundred twenty-eight thousand, four hundred fifty-four".