920640028 has 36 divisors (see below), whose sum is σ = 2044543032. Its totient is φ = 358690080.

The previous prime is 920640023. The next prime is 920640043. The reversal of 920640028 is 820046029.

It is a super-2 number, since 2×920640028² = 1695156122311681568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920640023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211351 + ... + 215662.

It is an arithmetic number, because the mean of its divisors is an integer number (56792862).

Almost surely, 2^920640028 is an apocalyptic number.

920640028 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is an amenable number.

920640028 is an abundant number, since it is smaller than the sum of its proper divisors (1123903004).

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

920640028 is a wasteful number, since it uses less digits than its factorization.

920640028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427042 (or 427033 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 920640028 is about 30342.0504910265. The cubic root of 920640028 is about 972.8143116488.

The spelling of 920640028 in words is "nine hundred twenty million, six hundred forty thousand, twenty-eight".