77028257 has 4 divisors (see below), whose sum is σ = 77204160. Its totient is φ = 76852356.

The previous prime is 77028221. The next prime is 77028353. The reversal of 77028257 is 75282077.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77028257 - 2¹⁸ = 76766113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77028257.

It is not an unprimeable number, because it can be changed into a prime (77078257) 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, 87293 + ... + 88170.

It is an arithmetic number, because the mean of its divisors is an integer number (19301040).

Almost surely, 2^77028257 is an apocalyptic number.

It is an amenable number.

77028257 is a deficient number, since it is larger than the sum of its proper divisors (175903).

77028257 is a wasteful number, since it uses less digits than its factorization.

77028257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175902.

The product of its (nonzero) digits is 54880, while the sum is 38.

The square root of 77028257 is about 8776.5743317082. The cubic root of 77028257 is about 425.4841209888.

The spelling of 77028257 in words is "seventy-seven million, twenty-eight thousand, two hundred fifty-seven".