66203478 has 48 divisors (see below), whose sum is σ = 157248000. Its totient is φ = 19963440.

The previous prime is 66203477. The next prime is 66203537. The reversal of 66203478 is 87430266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66203477) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46623 + ... + 48021.

It is an arithmetic number, because the mean of its divisors is an integer number (3276000).

Almost surely, 2^66203478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66203478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78624000).

66203478 is an abundant number, since it is smaller than the sum of its proper divisors (91044522).

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

66203478 is a wasteful number, since it uses less digits than its factorization.

66203478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1657 (or 1654 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 66203478 is about 8136.5519724266. The cubic root of 66203478 is about 404.5388807630.

The spelling of 66203478 in words is "sixty-six million, two hundred three thousand, four hundred seventy-eight".