75721497 has 8 divisors (see below), whose sum is σ = 105351744. Its totient is φ = 48286128.

The previous prime is 75721469. The next prime is 75721511. The reversal of 75721497 is 79412757.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 75721497 - 2⁶ = 75721433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (75721447) 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, 548638 + ... + 548775.

It is an arithmetic number, because the mean of its divisors is an integer number (13168968).

Almost surely, 2^75721497 is an apocalyptic number.

It is an amenable number.

75721497 is a deficient number, since it is larger than the sum of its proper divisors (29630247).

75721497 is a wasteful number, since it uses less digits than its factorization.

75721497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097439.

The product of its digits is 123480, while the sum is 42.

The square root of 75721497 is about 8701.8099841355. The cubic root of 75721497 is about 423.0643174112.

The spelling of 75721497 in words is "seventy-five million, seven hundred twenty-one thousand, four hundred ninety-seven".