66837620 has 12 divisors (see below), whose sum is σ = 140359044. Its totient is φ = 26735040.

The previous prime is 66837613. The next prime is 66837629. The reversal of 66837620 is 2673866.

It can be written as a sum of positive squares in 2 ways, for example, as 9168784 + 57668836 = 3028^2 + 7594^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66837629) 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, 1670921 + ... + 1670960.

It is an arithmetic number, because the mean of its divisors is an integer number (11696587).

Almost surely, 2^66837620 is an apocalyptic number.

It is an amenable number.

66837620 is an abundant number, since it is smaller than the sum of its proper divisors (73521424).

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

66837620 is a wasteful number, since it uses less digits than its factorization.

66837620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3341890 (or 3341888 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 66837620 is about 8175.4278175518. The cubic root of 66837620 is about 405.8264281069.

The spelling of 66837620 in words is "sixty-six million, eight hundred thirty-seven thousand, six hundred twenty".