66787390 has 32 divisors (see below), whose sum is σ = 128926080. Its totient is φ = 24820224.

The previous prime is 66787387. The next prime is 66787397. The reversal of 66787390 is 9378766.

It is a self number, because there is not a number n which added to its sum of digits gives 66787390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66787397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10944 + ... + 15916.

It is an arithmetic number, because the mean of its divisors is an integer number (4028940).

Almost surely, 2^66787390 is an apocalyptic number.

66787390 is a deficient number, since it is larger than the sum of its proper divisors (62138690).

66787390 is a wasteful number, since it uses less digits than its factorization.

66787390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5076.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 66787390 is about 8172.3552296752. The cubic root of 66787390 is about 405.7247400150.

The spelling of 66787390 in words is "sixty-six million, seven hundred eighty-seven thousand, three hundred ninety".