81923002 has 24 divisors (see below), whose sum is σ = 146440980. Its totient is φ = 34251840.

The previous prime is 81922991. The next prime is 81923053. The reversal of 81923002 is 20032918.

It can be written as a sum of positive squares in 2 ways, for example, as 81920601 + 2401 = 9051^2 + 49^2 .

It is a super-2 number, since 2×81923002² = 13422756513384008, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6177 + ... + 14212.

Almost surely, 2^81923002 is an apocalyptic number.

81923002 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

81923002 is a deficient number, since it is larger than the sum of its proper divisors (64517978).

81923002 is a wasteful number, since it uses less digits than its factorization.

81923002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20446 (or 20439 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 81923002 is about 9051.1326363058. The cubic root of 81923002 is about 434.3121237217.

The spelling of 81923002 in words is "eighty-one million, nine hundred twenty-three thousand, two".