645270747 has 16 divisors (see below), whose sum is σ = 940651392. Its totient is φ = 390208320.

The previous prime is 645270739. The next prime is 645270767. The reversal of 645270747 is 747072546.

It is not a de Polignac number, because 645270747 - 2³ = 645270739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645270699 and 645270708.

It is not an unprimeable number, because it can be changed into a prime (645270767) 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, 6313 + ... + 36474.

It is an arithmetic number, because the mean of its divisors is an integer number (58790712).

Almost surely, 2^645270747 is an apocalyptic number.

645270747 is a deficient number, since it is larger than the sum of its proper divisors (295380645).

645270747 is a wasteful number, since it uses less digits than its factorization.

645270747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43258.

The product of its (nonzero) digits is 329280, while the sum is 42.

The square root of 645270747 is about 25402.1799655069. The cubic root of 645270747 is about 864.1331362587.

The spelling of 645270747 in words is "six hundred forty-five million, two hundred seventy thousand, seven hundred forty-seven".