84720531 has 8 divisors (see below), whose sum is σ = 129097984. Its totient is φ = 48411720.

The previous prime is 84720529. The next prime is 84720541. The reversal of 84720531 is 13502748.

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

It is not a de Polignac number, because 84720531 - 2¹ = 84720529 is a prime.

It is a super-2 number, since 2×84720531² = 14355136745843922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84720541) 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, 2017135 + ... + 2017176.

It is an arithmetic number, because the mean of its divisors is an integer number (16137248).

Almost surely, 2^84720531 is an apocalyptic number.

84720531 is a deficient number, since it is larger than the sum of its proper divisors (44377453).

84720531 is a wasteful number, since it uses less digits than its factorization.

84720531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4034321.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 84720531 is about 9204.3756442249. The cubic root of 84720531 is about 439.2005645711.

The spelling of 84720531 in words is "eighty-four million, seven hundred twenty thousand, five hundred thirty-one".