81525264 has 40 divisors (see below), whose sum is σ = 217872960. Its totient is φ = 26237568.

The previous prime is 81525263. The next prime is 81525277. The reversal of 81525264 is 46252518.

It is not an unprimeable number, because it can be changed into a prime (81525263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27892 + ... + 30675.

It is an arithmetic number, because the mean of its divisors is an integer number (5446824).

Almost surely, 2^81525264 is an apocalyptic number.

It is an amenable number.

81525264 is an abundant number, since it is smaller than the sum of its proper divisors (136347696).

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

81525264 is a wasteful number, since it uses less digits than its factorization.

81525264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58607 (or 58601 counting only the distinct ones).

The product of its digits is 19200, while the sum is 33.

The square root of 81525264 is about 9029.1341777603. The cubic root of 81525264 is about 433.6081181561.

The spelling of 81525264 in words is "eighty-one million, five hundred twenty-five thousand, two hundred sixty-four".