745578637 has 4 divisors (see below), whose sum is σ = 746849376. Its totient is φ = 744307900.

The previous prime is 745578629. The next prime is 745578643. The reversal of 745578637 is 736875547.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 736875547 = 61 ⋅12079927.

It is a cyclic number.

It is not a de Polignac number, because 745578637 - 2³ = 745578629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745578697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 634489 + ... + 635662.

It is an arithmetic number, because the mean of its divisors is an integer number (186712344).

Almost surely, 2^745578637 is an apocalyptic number.

It is an amenable number.

745578637 is a deficient number, since it is larger than the sum of its proper divisors (1270739).

745578637 is a wasteful number, since it uses less digits than its factorization.

745578637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270738.

The product of its digits is 4939200, while the sum is 52.

The square root of 745578637 is about 27305.2858802101. The cubic root of 745578637 is about 906.7714099332.

The spelling of 745578637 in words is "seven hundred forty-five million, five hundred seventy-eight thousand, six hundred thirty-seven".