81262625 has 32 divisors (see below), whose sum is σ = 106589184. Its totient is φ = 61776000.

The previous prime is 81262603. The next prime is 81262631. The reversal of 81262625 is 52626218.

It is not a de Polignac number, because 81262625 - 2¹⁴ = 81246241 is a prime.

It is a super-2 number, since 2×81262625² = 13207228443781250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81262591 and 81262600.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 259469 + ... + 259781.

It is an arithmetic number, because the mean of its divisors is an integer number (3330912).

Almost surely, 2^81262625 is an apocalyptic number.

It is an amenable number.

81262625 is a deficient number, since it is larger than the sum of its proper divisors (25326559).

81262625 is a wasteful number, since it uses less digits than its factorization.

81262625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 416 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 81262625 is about 9014.5784704555. The cubic root of 81262625 is about 433.1419848803.

The spelling of 81262625 in words is "eighty-one million, two hundred sixty-two thousand, six hundred twenty-five".