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645840001 = 1961678317
BaseRepresentation
bin100110011111101…
…011110010000001
31200000021001221001
4212133223302001
52310313340001
6144030332001
722001356312
oct4637536201
91600231831
10645840001
11301618174
1216035a001
13a3a58661
1461aba609
153ba75001
hex267ebc81

645840001 has 16 divisors (see below), whose sum is σ = 701373760. Its totient is φ = 592764480.

The previous prime is 645839993. The next prime is 645840007. The reversal of 645840001 is 100048546.

It is a cyclic number.

It is not a de Polignac number, because 645840001 - 23 = 645839993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645840007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73495 + ... + 81811.

It is an arithmetic number, because the mean of its divisors is an integer number (43835860).

Almost surely, 2645840001 is an apocalyptic number.

645840001 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

645840001 is a deficient number, since it is larger than the sum of its proper divisors (55533759).

645840001 is a wasteful number, since it uses less digits than its factorization.

645840001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8464.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 645840001 is about 25413.3823211315. The cubic root of 645840001 is about 864.3871726012.

Adding to 645840001 its reverse (100048546), we get a palindrome (745888547).

The spelling of 645840001 in words is "six hundred forty-five million, eight hundred forty thousand, one".

Divisors: 1 19 61 67 1159 1273 4087 8317 77653 158023 507337 557239 9639403 10587541 33991579 645840001