8457720438 has 8 divisors (see below), whose sum is σ = 16915440888. Its totient is φ = 2819240144.

The previous prime is 8457720437. The next prime is 8457720451. The reversal of 8457720438 is 8340277548.

It is a sphenic number, since it is the product of 3 distinct primes.

8457720438 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8457720431) 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, 704810031 + ... + 704810042.

It is an arithmetic number, because the mean of its divisors is an integer number (2114430111).

Almost surely, 2^8457720438 is an apocalyptic number.

8457720438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

8457720438 is a wasteful number, since it uses less digits than its factorization.

8457720438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409620078.

The product of its (nonzero) digits is 1505280, while the sum is 48.

The square root of 8457720438 is about 91965.8656132807. The cubic root of 8457720438 is about 2037.4381880354.

The spelling of 8457720438 in words is "eight billion, four hundred fifty-seven million, seven hundred twenty thousand, four hundred thirty-eight".