925728021 has 20 divisors (see below), whose sum is σ = 1388692800. Its totient is φ = 614556936.

The previous prime is 925727987. The next prime is 925728061. The reversal of 925728021 is 120827529.

925728021 is a `hidden beast` number, since 9 + 2 + 572 + 80 + 2 + 1 = 666.

It is not a de Polignac number, because 925728021 - 2¹³ = 925719829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (925728061) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4551 + ... + 43268.

It is an arithmetic number, because the mean of its divisors is an integer number (69434640).

Almost surely, 2^925728021 is an apocalyptic number.

It is an amenable number.

925728021 is a deficient number, since it is larger than the sum of its proper divisors (462964779).

925728021 is a wasteful number, since it uses less digits than its factorization.

925728021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48070 (or 48061 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 925728021 is about 30425.7788889619. The cubic root of 925728021 is about 974.6031331546.

The spelling of 925728021 in words is "nine hundred twenty-five million, seven hundred twenty-eight thousand, twenty-one".