66471428 has 12 divisors (see below), whose sum is σ = 123167772. Its totient is φ = 31280640.

The previous prime is 66471389. The next prime is 66471467. The reversal of 66471428 is 82417466.

It is an interprime number because it is at equal distance from previous prime (66471389) and next prime (66471467).

It can be written as a sum of positive squares in 2 ways, for example, as 55830784 + 10640644 = 7472^2 + 3262^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66471391 and 66471400.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488693 + ... + 488828.

It is an arithmetic number, because the mean of its divisors is an integer number (10263981).

Almost surely, 2^66471428 is an apocalyptic number.

66471428 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

66471428 is a deficient number, since it is larger than the sum of its proper divisors (56696344).

66471428 is a wasteful number, since it uses less digits than its factorization.

66471428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977542 (or 977540 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 66471428 is about 8153.0011652152. The cubic root of 66471428 is about 405.0839190020.

The spelling of 66471428 in words is "sixty-six million, four hundred seventy-one thousand, four hundred twenty-eight".