745138647 has 12 divisors (see below), whose sum is σ = 1174158024. Its totient is φ = 451599120.

The previous prime is 745138609. The next prime is 745138649. The reversal of 745138647 is 746831547.

745138647 is a `hidden beast` number, since 74 + 513 + 8 + 64 + 7 = 666.

It is not a de Polignac number, because 745138647 - 2⁸ = 745138391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745138649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3763228 + ... + 3763425.

It is an arithmetic number, because the mean of its divisors is an integer number (97846502).

Almost surely, 2^745138647 is an apocalyptic number.

745138647 is a deficient number, since it is larger than the sum of its proper divisors (429019377).

745138647 is a wasteful number, since it uses less digits than its factorization.

745138647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7526670 (or 7526667 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 745138647 is about 27297.2278262830. The cubic root of 745138647 is about 906.5930031494.

The spelling of 745138647 in words is "seven hundred forty-five million, one hundred thirty-eight thousand, six hundred forty-seven".