76720457 has 8 divisors (see below), whose sum is σ = 86581440. Its totient is φ = 67340560.

The previous prime is 76720453. The next prime is 76720463. The reversal of 76720457 is 75402767.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 76720457 - 2² = 76720453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 76720457.

It is not an unprimeable number, because it can be changed into a prime (76720453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119933 + ... + 120570.

It is an arithmetic number, because the mean of its divisors is an integer number (10822680).

Almost surely, 2^76720457 is an apocalyptic number.

It is an amenable number.

76720457 is a deficient number, since it is larger than the sum of its proper divisors (9860983).

76720457 is a wasteful number, since it uses less digits than its factorization.

76720457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240543.

The product of its (nonzero) digits is 82320, while the sum is 38.

The square root of 76720457 is about 8759.0214636111. The cubic root of 76720457 is about 424.9166286290.

It can be divided in two parts, 76720 and 457, that added together give a palindrome (77177).

The spelling of 76720457 in words is "seventy-six million, seven hundred twenty thousand, four hundred fifty-seven".