66901428 has 36 divisors (see below), whose sum is σ = 184486848. Its totient is φ = 20273040.

The previous prime is 66901391. The next prime is 66901481. The reversal of 66901428 is 82410966.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 66901392 and 66901401.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 84076 + ... + 84867.

Almost surely, 2^66901428 is an apocalyptic number.

It is an amenable number.

66901428 is an abundant number, since it is smaller than the sum of its proper divisors (117585420).

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

66901428 is a wasteful number, since it uses less digits than its factorization.

66901428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168964 (or 168959 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 66901428 is about 8179.3293123581. The cubic root of 66901428 is about 405.9555307325.

It can be divided in two parts, 6690 and 1428, that added together give a palindrome (8118).

The spelling of 66901428 in words is "sixty-six million, nine hundred one thousand, four hundred twenty-eight".