897728751 has 12 divisors (see below), whose sum is σ = 1344746312. Its totient is φ = 598485672.

The previous prime is 897728737. The next prime is 897728753. The reversal of 897728751 is 157827798.

It is a happy number.

It is not a de Polignac number, because 897728751 - 2⁹ = 897728239 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 (897728753) 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, 1846936 + ... + 1847421.

Almost surely, 2^897728751 is an apocalyptic number.

897728751 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

897728751 is a deficient number, since it is larger than the sum of its proper divisors (447017561).

897728751 is an equidigital number, since it uses as much as digits as its factorization.

897728751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3694372 (or 3694360 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 54.

The square root of 897728751 is about 29962.1219375397. The cubic root of 897728751 is about 964.6765275550.

The spelling of 897728751 in words is "eight hundred ninety-seven million, seven hundred twenty-eight thousand, seven hundred fifty-one".