66105428 has 6 divisors (see below), whose sum is σ = 115684506. Its totient is φ = 33052712.

The previous prime is 66105419. The next prime is 66105437. The reversal of 66105428 is 82450166.

It is an interprime number because it is at equal distance from previous prime (66105419) and next prime (66105437).

It can be written as a sum of positive squares in only one way, i.e., 64288324 + 1817104 = 8018^2 + 1348^2 .

It is a super-2 number, since 2×66105428² = 8739855222126368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66105394 and 66105403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8263175 + ... + 8263182.

It is an arithmetic number, because the mean of its divisors is an integer number (19280751).

Almost surely, 2^66105428 is an apocalyptic number.

It is an amenable number.

66105428 is a deficient number, since it is larger than the sum of its proper divisors (49579078).

66105428 is a wasteful number, since it uses less digits than its factorization.

66105428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16526361 (or 16526359 counting only the distinct ones).

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

The square root of 66105428 is about 8130.5244603285. The cubic root of 66105428 is about 404.3390693310.

The spelling of 66105428 in words is "sixty-six million, one hundred five thousand, four hundred twenty-eight".