83720055 has 8 divisors (see below), whose sum is σ = 133952112. Its totient is φ = 44650688.

The previous prime is 83720029. The next prime is 83720081. The reversal of 83720055 is 55002738.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (83720029) and next prime (83720081).

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

It is a cyclic number.

It is not a de Polignac number, because 83720055 - 2¹² = 83715959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2790654 + ... + 2790683.

It is an arithmetic number, because the mean of its divisors is an integer number (16744014).

Almost surely, 2^83720055 is an apocalyptic number.

83720055 is a deficient number, since it is larger than the sum of its proper divisors (50232057).

83720055 is a wasteful number, since it uses less digits than its factorization.

83720055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5581345.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 83720055 is about 9149.8663924672. The cubic root of 83720055 is about 437.4648548639.

The spelling of 83720055 in words is "eighty-three million, seven hundred twenty thousand, fifty-five".