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30047128 = 233755891
BaseRepresentation
bin111001010011…
…1101110011000
32002112112220121
41302213232120
530143002003
62552003024
7513252646
oct162475630
962475817
1030047128
1115a62941
12a090474
1362c0587
143dc2196
152987cbd
hex1ca7b98

30047128 has 8 divisors (see below), whose sum is σ = 56338380. Its totient is φ = 15023560.

The previous prime is 30047123. The next prime is 30047167. The reversal of 30047128 is 82174003.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30047123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1877938 + ... + 1877953.

Almost surely, 230047128 is an apocalyptic number.

It is an amenable number.

30047128 is a deficient number, since it is larger than the sum of its proper divisors (26291252).

30047128 is a wasteful number, since it uses less digits than its factorization.

30047128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3755897 (or 3755893 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 30047128 is about 5481.5260648838. The cubic root of 30047128 is about 310.8858739722.

The spelling of 30047128 in words is "thirty million, forty-seven thousand, one hundred twenty-eight".

Divisors: 1 2 4 8 3755891 7511782 15023564 30047128