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28722045 = 35111091597
BaseRepresentation
bin110110110010…
…0001101111101
32000001020020110
41231210031331
524323101140
62503340233
7466063512
oct155441575
960036213
1028722045
1115238330
129751679
135c483c1
143b59309
1527c5380
hex1b6437d

28722045 has 32 divisors (see below), whose sum is σ = 50624640. Its totient is φ = 13789440.

The previous prime is 28722019. The next prime is 28722047. The reversal of 28722045 is 54022782.

It is not a de Polignac number, because 28722045 - 25 = 28722013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28722047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17187 + ... + 18783.

It is an arithmetic number, because the mean of its divisors is an integer number (1582020).

Almost surely, 228722045 is an apocalyptic number.

It is an amenable number.

28722045 is a deficient number, since it is larger than the sum of its proper divisors (21902595).

28722045 is a wasteful number, since it uses less digits than its factorization.

28722045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725.

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 28722045 is about 5359.2951961988. The cubic root of 28722045 is about 306.2469598476.

The spelling of 28722045 in words is "twenty-eight million, seven hundred twenty-two thousand, forty-five".

Divisors: 1 3 5 11 15 33 55 109 165 327 545 1199 1597 1635 3597 4791 5995 7985 17567 17985 23955 52701 87835 174073 263505 522219 870365 1914803 2611095 5744409 9574015 28722045