74809729 has 8 divisors (see below), whose sum is σ = 76716072. Its totient is φ = 72925440.

The previous prime is 74809711. The next prime is 74809739. The reversal of 74809729 is 92790847.

74809729 = 757² + 758² + ... + 869².

It can be written as a sum of positive squares in 4 ways, for example, as 3441025 + 71368704 = 1855^2 + 8448^2 .

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 74809729 - 2²⁵ = 41255297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74809739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1467 + ... + 12319.

It is an arithmetic number, because the mean of its divisors is an integer number (9589509).

Almost surely, 2^74809729 is an apocalyptic number.

It is an amenable number.

74809729 is a deficient number, since it is larger than the sum of its proper divisors (1906343).

74809729 is a wasteful number, since it uses less digits than its factorization.

74809729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11027.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 74809729 is about 8649.2617604048. The cubic root of 74809729 is about 421.3594066983.

The spelling of 74809729 in words is "seventy-four million, eight hundred nine thousand, seven hundred twenty-nine".