66477888 has 224 divisors, whose sum is σ = 216529920. Its totient is φ = 19906560.

The previous prime is 66477877. The next prime is 66477893. The reversal of 66477888 is 88877466.

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (3612672) is a multiple of the sum of its prime divisors (126).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 910620 + ... + 910692.

Almost surely, 2^66477888 is an apocalyptic number.

66477888 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66477888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108264960).

66477888 is an abundant number, since it is smaller than the sum of its proper divisors (150052032).

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

66477888 is a wasteful number, since it uses less digits than its factorization.

66477888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 126 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The square root of 66477888 is about 8153.3973287213. The cubic root of 66477888 is about 405.0970412182.

It can be divided in two parts, 6647 and 7888, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 66477888 in words is "sixty-six million, four hundred seventy-seven thousand, eight hundred eighty-eight".