68428957 has 2 divisors, whose sum is σ = 68428958. Its totient is φ = 68428956.

The previous prime is 68428949. The next prime is 68428973. The reversal of 68428957 is 75982486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54967396 + 13461561 = 7414^2 + 3669^2 .

It is a cyclic number.

It is not a de Polignac number, because 68428957 - 2³ = 68428949 is a prime.

It is a super-2 number, since 2×68428957² = 9365044312215698, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68428957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68428357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34214478 + 34214479.

It is an arithmetic number, because the mean of its divisors is an integer number (34214479).

Almost surely, 2^68428957 is an apocalyptic number.

It is an amenable number.

68428957 is a deficient number, since it is larger than the sum of its proper divisors (1).

68428957 is an equidigital number, since it uses as much as digits as its factorization.

68428957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 49.

The square root of 68428957 is about 8272.1797006593. The cubic root of 68428957 is about 409.0219738196.

It can be divided in two parts, 68 and 428957, that added together give a square (429025 = 655²).

The spelling of 68428957 in words is "sixty-eight million, four hundred twenty-eight thousand, nine hundred fifty-seven".