81962074 has 4 divisors (see below), whose sum is σ = 122943114. Its totient is φ = 40981036.

The previous prime is 81962071. The next prime is 81962081. The reversal of 81962074 is 47026918.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 78446449 + 3515625 = 8857^2 + 1875^2 .

It is not an unprimeable number, because it can be changed into a prime (81962071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20490517 + ... + 20490520.

Almost surely, 2^81962074 is an apocalyptic number.

81962074 is a deficient number, since it is larger than the sum of its proper divisors (40981040).

81962074 is a wasteful number, since it uses less digits than its factorization.

81962074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40981039.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 81962074 is about 9053.2907829142. The cubic root of 81962074 is about 434.3811590590.

The spelling of 81962074 in words is "eighty-one million, nine hundred sixty-two thousand, seventy-four".