68213990 has 32 divisors (see below), whose sum is σ = 139194720. Its totient is φ = 23860224.

The previous prime is 68213987. The next prime is 68213993. The reversal of 68213990 is 9931286.

It is an interprime number because it is at equal distance from previous prime (68213987) and next prime (68213993).

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68213993) 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, 11339 + ... + 16278.

It is an arithmetic number, because the mean of its divisors is an integer number (4349835).

Almost surely, 2^68213990 is an apocalyptic number.

68213990 is an abundant number, since it is smaller than the sum of its proper divisors (70980730).

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

68213990 is a wasteful number, since it uses less digits than its factorization.

68213990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27656.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 68213990 is about 8259.1761090317. The cubic root of 68213990 is about 408.5932154701.

The spelling of 68213990 in words is "sixty-eight million, two hundred thirteen thousand, nine hundred ninety".