68940690 has 64 divisors (see below), whose sum is σ = 203648256. Its totient is φ = 14545152.

The previous prime is 68940671. The next prime is 68940749. The reversal of 68940690 is 9604986.

68940690 = 825² + 826² + ... + 915².

It is a super-2 number, since 2×68940690² = 9505637475352200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9897 + ... + 15356.

It is an arithmetic number, because the mean of its divisors is an integer number (3182004).

Almost surely, 2^68940690 is an apocalyptic number.

68940690 is an abundant number, since it is smaller than the sum of its proper divisors (134707566).

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

68940690 is a wasteful number, since it uses less digits than its factorization.

68940690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25283.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 68940690 is about 8303.0530529438. The cubic root of 68940690 is about 410.0390405021.

The spelling of 68940690 in words is "sixty-eight million, nine hundred forty thousand, six hundred ninety".