68490000 has 150 divisors (see below), whose sum is σ = 239834166. Its totient is φ = 18240000.

The previous prime is 68489983. The next prime is 68490017. The reversal of 68490000 is 9486.

It is an interprime number because it is at equal distance from previous prime (68489983) and next prime (68490017).

It can be written as a sum of positive squares in 5 ways, for example, as 51151104 + 17338896 = 7152^2 + 4164^2 .

It is a tau number, because it is divible by the number of its divisors (150).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 89620 + ... + 90380.

Almost surely, 2^68490000 is an apocalyptic number.

68490000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68490000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119917083).

68490000 is an abundant number, since it is smaller than the sum of its proper divisors (171344166).

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

68490000 is a wasteful number, since it uses less digits than its factorization.

68490000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795 (or 771 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 68490000 is about 8275.8685344802. The cubic root of 68490000 is about 409.1435622464.

Adding to 68490000 its reverse (9486), we get a palindrome (68499486).

The spelling of 68490000 in words is "sixty-eight million, four hundred ninety thousand".