7745457820 has 12 divisors (see below), whose sum is σ = 16265461464. Its totient is φ = 3098183120.

The previous prime is 7745457793. The next prime is 7745457821. The reversal of 7745457820 is 287545477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7745457821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193636426 + ... + 193636465.

It is an arithmetic number, because the mean of its divisors is an integer number (1355455122).

Almost surely, 2^7745457820 is an apocalyptic number.

It is an amenable number.

7745457820 is an abundant number, since it is smaller than the sum of its proper divisors (8520003644).

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

7745457820 is a wasteful number, since it uses less digits than its factorization.

7745457820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387272900 (or 387272898 counting only the distinct ones).

The product of its (nonzero) digits is 2195200, while the sum is 49.

The square root of 7745457820 is about 88008.2826783934. The cubic root of 7745457820 is about 1978.5591173267.

The spelling of 7745457820 in words is "seven billion, seven hundred forty-five million, four hundred fifty-seven thousand, eight hundred twenty".