81958002 has 32 divisors (see below), whose sum is σ = 193795200. Its totient is φ = 22608768.

The previous prime is 81957979. The next prime is 81958007. The reversal of 81958002 is 20085918.

It is a happy number.

It is a super-2 number, since 2×81958002² = 13434228183664008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81958007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32427 + ... + 34862.

It is an arithmetic number, because the mean of its divisors is an integer number (6056100).

Almost surely, 2^81958002 is an apocalyptic number.

81958002 is an abundant number, since it is smaller than the sum of its proper divisors (111837198).

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

81958002 is a wasteful number, since it uses less digits than its factorization.

81958002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67330.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 81958002 is about 9053.0658895205. The cubic root of 81958002 is about 434.3739653685.

The spelling of 81958002 in words is "eighty-one million, nine hundred fifty-eight thousand, two".