68612557 has 16 divisors (see below), whose sum is σ = 76451760. Its totient is φ = 61171200.

The previous prime is 68612549. The next prime is 68612569. The reversal of 68612557 is 75521686.

It can be written as a sum of positive squares in 8 ways, for example, as 1142761 + 67469796 = 1069^2 + 8214^2 .

It is a cyclic number.

It is not a de Polignac number, because 68612557 - 2³ = 68612549 is a prime.

It is a Duffinian number.

Its product of digits (100800) is a multiple of the sum of its prime divisors (1344).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68610557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57507 + ... + 58687.

It is an arithmetic number, because the mean of its divisors is an integer number (4778235).

Almost surely, 2^68612557 is an apocalyptic number.

It is an amenable number.

68612557 is a deficient number, since it is larger than the sum of its proper divisors (7839203).

68612557 is a wasteful number, since it uses less digits than its factorization.

68612557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344.

The product of its digits is 100800, while the sum is 40.

The square root of 68612557 is about 8283.2697046517. The cubic root of 68612557 is about 409.3874593026.

It can be divided in two parts, 68612 and 557, that added together give a square (69169 = 263²).

The spelling of 68612557 in words is "sixty-eight million, six hundred twelve thousand, five hundred fifty-seven".