669477744 has 320 divisors, whose sum is σ = 2219857920. Its totient is φ = 191600640.

The previous prime is 669477719. The next prime is 669477769. The reversal of 669477744 is 447774966.

It is an interprime number because it is at equal distance from previous prime (669477719) and next prime (669477769).

It is a super-2 number, since 2×669477744² = 896400899422659072, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9170892 + ... + 9170964.

It is an arithmetic number, because the mean of its divisors is an integer number (6937056).

Almost surely, 2^669477744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669477744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1109928960).

669477744 is an abundant number, since it is smaller than the sum of its proper divisors (1550380176).

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

669477744 is a wasteful number, since it uses less digits than its factorization.

669477744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 185 counting only the distinct ones).

The product of its digits is 7112448, while the sum is 54.

The square root of 669477744 is about 25874.2679896456. The cubic root of 669477744 is about 874.8065940972.

It can be divided in two parts, 66947 and 7744, that added together give a triangular number (74691 = T₃₈₆).

The spelling of 669477744 in words is "six hundred sixty-nine million, four hundred seventy-seven thousand, seven hundred forty-four".