81247752 has 32 divisors (see below), whose sum is σ = 225688800. Its totient is φ = 27082512.

The previous prime is 81247721. The next prime is 81247757. The reversal of 81247752 is 25774218.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (81247757) 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, 187858 + ... + 188289.

It is an arithmetic number, because the mean of its divisors is an integer number (7052775).

Almost surely, 2^81247752 is an apocalyptic number.

It is an amenable number.

81247752 is an abundant number, since it is smaller than the sum of its proper divisors (144441048).

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

81247752 is a wasteful number, since it uses less digits than its factorization.

81247752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376162 (or 376152 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 81247752 is about 9013.7534911933. The cubic root of 81247752 is about 433.1155581608.

It can be divided in two parts, 8124 and 7752, that added together give a square (15876 = 126²).

The spelling of 81247752 in words is "eighty-one million, two hundred forty-seven thousand, seven hundred fifty-two".