77148257 has 4 divisors (see below), whose sum is σ = 77168640. Its totient is φ = 77127876.

The previous prime is 77148229. The next prime is 77148259. The reversal of 77148257 is 75284177.

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 77148257 - 2¹⁶ = 77082721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77148259) 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, 2657 + ... + 12702.

It is an arithmetic number, because the mean of its divisors is an integer number (19292160).

Almost surely, 2^77148257 is an apocalyptic number.

It is an amenable number.

77148257 is a deficient number, since it is larger than the sum of its proper divisors (20383).

77148257 is a wasteful number, since it uses less digits than its factorization.

77148257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20382.

The product of its digits is 109760, while the sum is 41.

The square root of 77148257 is about 8783.4080515481. The cubic root of 77148257 is about 425.7049559805.

The spelling of 77148257 in words is "seventy-seven million, one hundred forty-eight thousand, two hundred fifty-seven".