75720740 has 24 divisors (see below), whose sum is σ = 164498040. Its totient is φ = 29243648.

The previous prime is 75720739. The next prime is 75720767. The reversal of 75720740 is 4702757.

It is a happy number.

75720740 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 65536 + 75655204 = 256^2 + 8698^2 .

It is a super-2 number, since 2×75720740² = 11467260932295200, which contains 22 as substring.

75720740 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 75720697 and 75720706.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64697 + ... + 65856.

It is an arithmetic number, because the mean of its divisors is an integer number (6854085).

Almost surely, 2^75720740 is an apocalyptic number.

It is an amenable number.

75720740 is an abundant number, since it is smaller than the sum of its proper divisors (88777300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

75720740 is a wasteful number, since it uses less digits than its factorization.

75720740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130591 (or 130589 counting only the distinct ones).

The product of its (nonzero) digits is 13720, while the sum is 32.

The square root of 75720740 is about 8701.7664873289. The cubic root of 75720740 is about 423.0629075925.

The spelling of 75720740 in words is "seventy-five million, seven hundred twenty thousand, seven hundred forty".