68688450 has 36 divisors (see below), whose sum is σ = 184544178. Its totient is φ = 18316800.

The previous prime is 68688437. The next prime is 68688463. The reversal of 68688450 is 5488686.

It is an interprime number because it is at equal distance from previous prime (68688437) and next prime (68688463).

It can be written as a sum of positive squares in 3 ways, for example, as 29713401 + 38975049 = 5451^2 + 6243^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 68688396 and 68688405.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 75871 + ... + 76770.

Almost surely, 2^68688450 is an apocalyptic number.

68688450 is an abundant number, since it is smaller than the sum of its proper divisors (115855728).

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

68688450 is a wasteful number, since it uses less digits than its factorization.

68688450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152659 (or 152651 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The square root of 68688450 is about 8287.8495401401. The cubic root of 68688450 is about 409.5383461343.

The spelling of 68688450 in words is "sixty-eight million, six hundred eighty-eight thousand, four hundred fifty".