745815642 has 32 divisors (see below), whose sum is σ = 1752408000. Its totient is φ = 208619520.

The previous prime is 745815617. The next prime is 745815661. The reversal of 745815642 is 246518547.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 745815594 and 745815603.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 433767 + ... + 435482.

It is an arithmetic number, because the mean of its divisors is an integer number (54762750).

Almost surely, 2^745815642 is an apocalyptic number.

745815642 is an abundant number, since it is smaller than the sum of its proper divisors (1006592358).

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

745815642 is a wasteful number, since it uses less digits than its factorization.

745815642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869278.

The product of its digits is 268800, while the sum is 42.

The square root of 745815642 is about 27309.6254459852. The cubic root of 745815642 is about 906.8674814404.

The spelling of 745815642 in words is "seven hundred forty-five million, eight hundred fifteen thousand, six hundred forty-two".