66015390 has 32 divisors (see below), whose sum is σ = 181071360. Its totient is φ = 15089184.

The previous prime is 66015361. The next prime is 66015407. The reversal of 66015390 is 9351066.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 156970 + ... + 157389.

It is an arithmetic number, because the mean of its divisors is an integer number (5658480).

Almost surely, 2^66015390 is an apocalyptic number.

66015390 is an abundant number, since it is smaller than the sum of its proper divisors (115055970).

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

66015390 is a wasteful number, since it uses less digits than its factorization.

66015390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314376.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 66015390 is about 8124.9855384487. The cubic root of 66015390 is about 404.1554110775.

The spelling of 66015390 in words is "sixty-six million, fifteen thousand, three hundred ninety".