75721690 has 16 divisors (see below), whose sum is σ = 148690080. Its totient is φ = 27535120.

The previous prime is 75721673. The next prime is 75721691. The reversal of 75721690 is 9612757.

It is a super-2 number, since 2×75721690² = 11467548672912200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (75721691) 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, 344080 + ... + 344299.

It is an arithmetic number, because the mean of its divisors is an integer number (9293130).

Almost surely, 2^75721690 is an apocalyptic number.

75721690 is a deficient number, since it is larger than the sum of its proper divisors (72968390).

75721690 is a wasteful number, since it uses less digits than its factorization.

75721690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688397.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 75721690 is about 8701.8210737753. The cubic root of 75721690 is about 423.0646768483.

The spelling of 75721690 in words is "seventy-five million, seven hundred twenty-one thousand, six hundred ninety".