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145661290 = 2561238789
BaseRepresentation
bin10001010111010…
…01110101101010
3101011002100201121
420223221311222
5244242130130
622242005454
73416046325
oct1053516552
9334070647
10145661290
1175249535
124094688a
1324240118
14154b97bc
15cbc3d7a
hex8ae9d6a

145661290 has 16 divisors (see below), whose sum is σ = 266489640. Its totient is φ = 57309120.

The previous prime is 145661279. The next prime is 145661293. The reversal of 145661290 is 92166541.

It can be written as a sum of positive squares in 4 ways, for example, as 52171729 + 93489561 = 7223^2 + 9669^2 .

It is a super-2 number, since 2×1456612902 = 42434422808928200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145661293) 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, 118785 + ... + 120004.

Almost surely, 2145661290 is an apocalyptic number.

145661290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

145661290 is a deficient number, since it is larger than the sum of its proper divisors (120828350).

145661290 is a wasteful number, since it uses less digits than its factorization.

145661290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238857.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 145661290 is about 12069.0219156318. The cubic root of 145661290 is about 526.1562302483.

The spelling of 145661290 in words is "one hundred forty-five million, six hundred sixty-one thousand, two hundred ninety".

Divisors: 1 2 5 10 61 122 305 610 238789 477578 1193945 2387890 14566129 29132258 72830645 145661290