8457720 has 32 divisors (see below), whose sum is σ = 25373520. Its totient is φ = 2255360.

The previous prime is 8457677. The next prime is 8457727. The reversal of 8457720 is 277548.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8457727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35121 + ... + 35360.

Almost surely, 2^8457720 is an apocalyptic number.

It is an amenable number.

8457720 is an abundant number, since it is smaller than the sum of its proper divisors (16915800).

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

8457720 is a wasteful number, since it uses less digits than its factorization.

8457720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70495 (or 70491 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 8457720 is about 2908.2159479654. The cubic root of 8457720 is about 203.7438152864.

The spelling of 8457720 in words is "eight million, four hundred fifty-seven thousand, seven hundred twenty".