76720357 has 4 divisors (see below), whose sum is σ = 87680416. Its totient is φ = 65760300.

The previous prime is 76720331. The next prime is 76720361. The reversal of 76720357 is 75302767.

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: 75302767 = 839 ⋅89753.

It is a cyclic number.

It is not a de Polignac number, because 76720357 - 2¹⁹ = 76196069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76720327) 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, 5480019 + ... + 5480032.

It is an arithmetic number, because the mean of its divisors is an integer number (21920104).

Almost surely, 2^76720357 is an apocalyptic number.

It is an amenable number.

76720357 is a deficient number, since it is larger than the sum of its proper divisors (10960059).

76720357 is a wasteful number, since it uses less digits than its factorization.

76720357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10960058.

The product of its (nonzero) digits is 61740, while the sum is 37.

The square root of 76720357 is about 8759.0157552090. The cubic root of 76720357 is about 424.9164440121.

It can be divided in two parts, 76720 and 357, that added together give a palindrome (77077).

The spelling of 76720357 in words is "seventy-six million, seven hundred twenty thousand, three hundred fifty-seven".