745398728540 has 24 divisors (see below), whose sum is σ = 1565355238272. Its totient is φ = 298156080320.

The previous prime is 745398728521. The next prime is 745398728549. The reversal of 745398728540 is 45827893547.

It is a super-2 number, since 2×745398728540² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745398728549) 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, 2302997 + ... + 2606643.

It is an arithmetic number, because the mean of its divisors is an integer number (65223134928).

Almost surely, 2^745398728540 is an apocalyptic number.

It is an amenable number.

745398728540 is an abundant number, since it is smaller than the sum of its proper divisors (819956509732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

745398728540 is a wasteful number, since it uses less digits than its factorization.

745398728540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426397 (or 426395 counting only the distinct ones).

The product of its (nonzero) digits is 67737600, while the sum is 62.

The spelling of 745398728540 in words is "seven hundred forty-five billion, three hundred ninety-eight million, seven hundred twenty-eight thousand, five hundred forty".