66774040 has 16 divisors (see below), whose sum is σ = 150241680. Its totient is φ = 26709600.

The previous prime is 66774013. The next prime is 66774041. The reversal of 66774040 is 4047766.

It is a junction number, because it is equal to n+sod(n) for n = 66773987 and 66774005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66774041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 834636 + ... + 834715.

It is an arithmetic number, because the mean of its divisors is an integer number (9390105).

Almost surely, 2^66774040 is an apocalyptic number.

It is an amenable number.

66774040 is an abundant number, since it is smaller than the sum of its proper divisors (83467640).

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

66774040 is a wasteful number, since it uses less digits than its factorization.

66774040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669362 (or 1669358 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 66774040 is about 8171.5384108502. The cubic root of 66774040 is about 405.6977050403.

The spelling of 66774040 in words is "sixty-six million, seven hundred seventy-four thousand, forty".