68477521 has 4 divisors (see below), whose sum is σ = 78260032. Its totient is φ = 58695012.

The previous prime is 68477483. The next prime is 68477527. The reversal of 68477521 is 12577486.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12577486 = 2 ⋅6288743.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68477521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68477527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4891245 + ... + 4891258.

It is an arithmetic number, because the mean of its divisors is an integer number (19565008).

Almost surely, 2^68477521 is an apocalyptic number.

It is an amenable number.

68477521 is a deficient number, since it is larger than the sum of its proper divisors (9782511).

68477521 is an equidigital number, since it uses as much as digits as its factorization.

68477521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9782510.

The product of its digits is 94080, while the sum is 40.

The square root of 68477521 is about 8275.1145611405. The cubic root of 68477521 is about 409.1187118418.

The spelling of 68477521 in words is "sixty-eight million, four hundred seventy-seven thousand, five hundred twenty-one".