77728501 has 8 divisors (see below), whose sum is σ = 80352000. Its totient is φ = 75112320.

The previous prime is 77728397. The next prime is 77728513. The reversal of 77728501 is 10582777.

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 77728501 - 2¹³ = 77720309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77728531) 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, 27450 + ... + 30148.

It is an arithmetic number, because the mean of its divisors is an integer number (10044000).

Almost surely, 2^77728501 is an apocalyptic number.

It is an amenable number.

77728501 is a deficient number, since it is larger than the sum of its proper divisors (2623499).

77728501 is a wasteful number, since it uses less digits than its factorization.

77728501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3659.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 77728501 is about 8816.3768635421. The cubic root of 77728501 is about 426.7695557395.

The spelling of 77728501 in words is "seventy-seven million, seven hundred twenty-eight thousand, five hundred one".