81692946 has 12 divisors (see below), whose sum is σ = 177001422. Its totient is φ = 27230976.

The previous prime is 81692927. The next prime is 81692957. The reversal of 81692946 is 64929618.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 57927321 + 23765625 = 7611^2 + 4875^2 .

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2269231 + ... + 2269266.

Almost surely, 2^81692946 is an apocalyptic number.

81692946 is an abundant number, since it is smaller than the sum of its proper divisors (95308476).

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

81692946 is a wasteful number, since it uses less digits than its factorization.

81692946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4538505 (or 4538502 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 81692946 is about 9038.4150159196. The cubic root of 81692946 is about 433.9051977801.

The spelling of 81692946 in words is "eighty-one million, six hundred ninety-two thousand, nine hundred forty-six".