66990370 has 32 divisors (see below), whose sum is σ = 129859200. Its totient is φ = 24788736.

The previous prime is 66990337. The next prime is 66990373. The reversal of 66990370 is 7309966.

It is not an unprimeable number, because it can be changed into a prime (66990373) 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, 6691 + ... + 13369.

It is an arithmetic number, because the mean of its divisors is an integer number (4058100).

Almost surely, 2^66990370 is an apocalyptic number.

66990370 is a deficient number, since it is larger than the sum of its proper divisors (62868830).

66990370 is a wasteful number, since it uses less digits than its factorization.

66990370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6762.

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 66990370 is about 8184.7645048590. The cubic root of 66990370 is about 406.1353500534.

The spelling of 66990370 in words is "sixty-six million, nine hundred ninety thousand, three hundred seventy".