66819410 has 32 divisors (see below), whose sum is σ = 141177600. Its totient is φ = 22289472.

The previous prime is 66819397. The next prime is 66819437. The reversal of 66819410 is 1491866.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10310 + ... + 15489.

It is an arithmetic number, because the mean of its divisors is an integer number (4411800).

Almost surely, 2^66819410 is an apocalyptic number.

66819410 is an abundant number, since it is smaller than the sum of its proper divisors (74358190).

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

66819410 is a wasteful number, since it uses less digits than its factorization.

66819410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25850.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 66819410 is about 8174.3140384989. The cubic root of 66819410 is about 405.7895687728.

The spelling of 66819410 in words is "sixty-six million, eight hundred nineteen thousand, four hundred ten".