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81628670 = 259918237
BaseRepresentation
bin1001101110110…
…00110111111110
312200121011111002
410313120313332
5131344104140
612033330302
72010555314
oct467306776
9180534432
1081628670
1142093912
1223406992
1313bb07b6
14abac0b4
157276415
hex4dd8dfe

81628670 has 16 divisors (see below), whose sum is σ = 147097728. Its totient is φ = 32614560.

The previous prime is 81628669. The next prime is 81628709. The reversal of 81628670 is 7682618.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5792 + ... + 14028.

It is an arithmetic number, because the mean of its divisors is an integer number (9193608).

Almost surely, 281628670 is an apocalyptic number.

81628670 is a deficient number, since it is larger than the sum of its proper divisors (65469058).

81628670 is a wasteful number, since it uses less digits than its factorization.

81628670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9235.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 81628670 is about 9034.8586043169. The cubic root of 81628670 is about 433.7913690690.

The spelling of 81628670 in words is "eighty-one million, six hundred twenty-eight thousand, six hundred seventy".

Divisors: 1 2 5 10 991 1982 4955 8237 9910 16474 41185 82370 8162867 16325734 40814335 81628670