74727272 has 16 divisors (see below), whose sum is σ = 143901060. Its totient is φ = 36353664.

The previous prime is 74727271. The next prime is 74727277. The reversal of 74727272 is 27272747.

It can be written as a sum of positive squares in 2 ways, for example, as 72148036 + 2579236 = 8494^2 + 1606^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (74727271) 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, 125933 + ... + 126524.

Almost surely, 2^74727272 is an apocalyptic number.

It is an amenable number.

74727272 is a deficient number, since it is larger than the sum of its proper divisors (69173788).

74727272 is a wasteful number, since it uses less digits than its factorization.

74727272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252500 (or 252496 counting only the distinct ones).

The product of its digits is 76832, while the sum is 38.

The square root of 74727272 is about 8644.4937387912. The cubic root of 74727272 is about 421.2045391158.

The spelling of 74727272 in words is "seventy-four million, seven hundred twenty-seven thousand, two hundred seventy-two".