91982070 has 96 divisors (see below), whose sum is σ = 256763520. Its totient is φ = 22763520.

The previous prime is 91982069. The next prime is 91982081. The reversal of 91982070 is 7028919.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120490 + ... + 121250.

It is an arithmetic number, because the mean of its divisors is an integer number (2674620).

Almost surely, 2^91982070 is an apocalyptic number.

91982070 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 91982070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128381760).

91982070 is an abundant number, since it is smaller than the sum of its proper divisors (164781450).

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

91982070 is a wasteful number, since it uses less digits than its factorization.

91982070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 91982070 is about 9590.7283352204. The cubic root of 91982070 is about 451.4064146750.

The spelling of 91982070 in words is "ninety-one million, nine hundred eighty-two thousand, seventy".