66772524 has 96 divisors (see below), whose sum is σ = 195987456. Its totient is φ = 17222400.

The previous prime is 66772501. The next prime is 66772553. The reversal of 66772524 is 42527766.

It is a happy number.

It is a super-2 number, since 2×66772524² = 8917139922661152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50674 + ... + 51974.

It is an arithmetic number, because the mean of its divisors is an integer number (2041536).

Almost surely, 2^66772524 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66772524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97993728).

66772524 is an abundant number, since it is smaller than the sum of its proper divisors (129214932).

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

66772524 is a wasteful number, since it uses less digits than its factorization.

66772524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375 (or 1373 counting only the distinct ones).

The product of its digits is 141120, while the sum is 39.

The square root of 66772524 is about 8171.4456493328. The cubic root of 66772524 is about 405.6946347734.

The spelling of 66772524 in words is "sixty-six million, seven hundred seventy-two thousand, five hundred twenty-four".