76521729 has 4 divisors (see below), whose sum is σ = 102028976. Its totient is φ = 51014484.

The previous prime is 76521727. The next prime is 76521737. The reversal of 76521729 is 92712567.

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: 92712567 = 3 ⋅30904189.

It is not a de Polignac number, because 76521729 - 2¹ = 76521727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76521727) 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, 12753619 + ... + 12753624.

It is an arithmetic number, because the mean of its divisors is an integer number (25507244).

Almost surely, 2^76521729 is an apocalyptic number.

It is an amenable number.

76521729 is a deficient number, since it is larger than the sum of its proper divisors (25507247).

76521729 is a wasteful number, since it uses less digits than its factorization.

76521729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25507246.

The product of its digits is 52920, while the sum is 39.

The square root of 76521729 is about 8747.6699183268. The cubic root of 76521729 is about 424.5494260576.

The spelling of 76521729 in words is "seventy-six million, five hundred twenty-one thousand, seven hundred twenty-nine".