66996090 has 192 divisors, whose sum is σ = 217900800. Its totient is φ = 13934592.

The previous prime is 66996089. The next prime is 66996101. The reversal of 66996090 is 9069966.

66996090 = T₂₁₃₅ + T₂₁₃₆ + ... + T₂₁₆₃.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 347034 + ... + 347226.

It is an arithmetic number, because the mean of its divisors is an integer number (1134900).

Almost surely, 2^66996090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66996090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108950400).

66996090 is an abundant number, since it is smaller than the sum of its proper divisors (150904710).

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

66996090 is a wasteful number, since it uses less digits than its factorization.

66996090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 66996090 is about 8185.1139271240. The cubic root of 66996090 is about 406.1469090684.

The spelling of 66996090 in words is "sixty-six million, nine hundred ninety-six thousand, ninety".