8420720478 has 32 divisors (see below), whose sum is σ = 17204568480. Its totient is φ = 2746853760.

The previous prime is 8420720467. The next prime is 8420720489. The reversal of 8420720478 is 8740270248.

It is an interprime number because it is at equal distance from previous prime (8420720467) and next prime (8420720489).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13708 + ... + 130496.

It is an arithmetic number, because the mean of its divisors is an integer number (537642765).

Almost surely, 2^8420720478 is an apocalyptic number.

8420720478 is an abundant number, since it is smaller than the sum of its proper divisors (8783848002).

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

8420720478 is a wasteful number, since it uses less digits than its factorization.

8420720478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117052.

The product of its (nonzero) digits is 200704, while the sum is 42.

The square root of 8420720478 is about 91764.4837505230. The cubic root of 8420720478 is about 2034.4627870792.

The spelling of 8420720478 in words is "eight billion, four hundred twenty million, seven hundred twenty thousand, four hundred seventy-eight".