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28776620 = 2251438831
BaseRepresentation
bin110110111000…
…1100010101100
32000011000002202
41231301202230
524331322440
62504441032
7466411565
oct155614254
960130082
1028776620
1115275334
129779178
135c671b2
143b7116c
1527d6615
hex1b718ac

28776620 has 12 divisors (see below), whose sum is σ = 60430944. Its totient is φ = 11510640.

The previous prime is 28776607. The next prime is 28776641. The reversal of 28776620 is 2667782.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 719396 + ... + 719435.

It is an arithmetic number, because the mean of its divisors is an integer number (5035912).

Almost surely, 228776620 is an apocalyptic number.

28776620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28776620 is an abundant number, since it is smaller than the sum of its proper divisors (31654324).

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

28776620 is a wasteful number, since it uses less digits than its factorization.

28776620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438840 (or 1438838 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 28776620 is about 5364.3844008423. The cubic root of 28776620 is about 306.4408046014.

The spelling of 28776620 in words is "twenty-eight million, seven hundred seventy-six thousand, six hundred twenty".

Divisors: 1 2 4 5 10 20 1438831 2877662 5755324 7194155 14388310 28776620