245172736 has 20 divisors (see below), whose sum is σ = 489867642. Its totient is φ = 122586112.

The previous prime is 245172721. The next prime is 245172737. The reversal of 245172736 is 637271542.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 235438336 + 9734400 = 15344^2 + 3120^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 245172695 and 245172704.

It is not an unprimeable number, because it can be changed into a prime (245172737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 238915 + ... + 239938.

Almost surely, 2^245172736 is an apocalyptic number.

It is an amenable number.

245172736 is a deficient number, since it is larger than the sum of its proper divisors (244694906).

245172736 is an frugal number, since it uses more digits than its factorization.

245172736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478871 (or 478855 counting only the distinct ones).

The product of its digits is 70560, while the sum is 37.

The square root of 245172736 is about 15657.9927193750. The cubic root of 245172736 is about 625.8794965169.

The spelling of 245172736 in words is "two hundred forty-five million, one hundred seventy-two thousand, seven hundred thirty-six".