68215402 has 4 divisors (see below), whose sum is σ = 102323106. Its totient is φ = 34107700.

The previous prime is 68215397. The next prime is 68215403. The reversal of 68215402 is 20451286.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 61293241 + 6922161 = 7829^2 + 2631^2 .

It is not an unprimeable number, because it can be changed into a prime (68215403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17053849 + ... + 17053852.

Almost surely, 2^68215402 is an apocalyptic number.

68215402 is a deficient number, since it is larger than the sum of its proper divisors (34107704).

68215402 is a wasteful number, since it uses less digits than its factorization.

68215402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34107703.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 68215402 is about 8259.2615892706. The cubic root of 68215402 is about 408.5960346847.

Adding to 68215402 its reverse (20451286), we get a palindrome (88666688).

The spelling of 68215402 in words is "sixty-eight million, two hundred fifteen thousand, four hundred two".