81367952 has 10 divisors (see below), whose sum is σ = 157650438. Its totient is φ = 40683968.

The previous prime is 81367943. The next prime is 81367981. The reversal of 81367952 is 25976318.

It can be written as a sum of positive squares in only one way, i.e., 81072016 + 295936 = 9004^2 + 544^2 .

It is a super-2 number, since 2×81367952² = 13241487225348608, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2542733 + ... + 2542764.

Almost surely, 2^81367952 is an apocalyptic number.

It is an amenable number.

81367952 is a deficient number, since it is larger than the sum of its proper divisors (76282486).

81367952 is a wasteful number, since it uses less digits than its factorization.

81367952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5085505 (or 5085499 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 81367952 is about 9020.4186155632. The cubic root of 81367952 is about 433.3290403256.

The spelling of 81367952 in words is "eighty-one million, three hundred sixty-seven thousand, nine hundred fifty-two".