1028697240 has 64 divisors (see below), whose sum is σ = 3248524800. Its totient is φ = 259880832.

The previous prime is 1028697227. The next prime is 1028697247. The reversal of 1028697240 is 427968201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028697247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223312 + ... + 227871.

It is an arithmetic number, because the mean of its divisors is an integer number (50758200).

Almost surely, 2^1028697240 is an apocalyptic number.

1028697240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1028697240 is an abundant number, since it is smaller than the sum of its proper divisors (2219827560).

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

1028697240 is a wasteful number, since it uses less digits than its factorization.

1028697240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451216 (or 451212 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 1028697240 is about 32073.3103997701. The cubic root of 1028697240 is about 1009.4756746546.

The spelling of 1028697240 in words is "one billion, twenty-eight million, six hundred ninety-seven thousand, two hundred forty".