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28930578 = 2319253777
BaseRepresentation
bin110111001011…
…1001000010010
32000102211021220
41232113020102
524401234303
62512025510
7500622465
oct156271022
960384256
1028930578
111536aa76
129832296
135cbc2b1
143bb12dc
152817053
hex1b97212

28930578 has 16 divisors (see below), whose sum is σ = 60906720. Its totient is φ = 9135936.

The previous prime is 28930571. The next prime is 28930613. The reversal of 28930578 is 87503982.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28930571) 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, 126775 + ... + 127002.

It is an arithmetic number, because the mean of its divisors is an integer number (3806670).

Almost surely, 228930578 is an apocalyptic number.

28930578 is an abundant number, since it is smaller than the sum of its proper divisors (31976142).

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

28930578 is a wasteful number, since it uses less digits than its factorization.

28930578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253801.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 28930578 is about 5378.7152741152. The cubic root of 28930578 is about 306.9863299271.

The spelling of 28930578 in words is "twenty-eight million, nine hundred thirty thousand, five hundred seventy-eight".

Divisors: 1 2 3 6 19 38 57 114 253777 507554 761331 1522662 4821763 9643526 14465289 28930578