77091957 has 12 divisors (see below), whose sum is σ = 117905580. Its totient is φ = 48371328.

The previous prime is 77091943. The next prime is 77091961. The reversal of 77091957 is 75919077.

It can be written as a sum of positive squares in 2 ways, for example, as 38825361 + 38266596 = 6231^2 + 6186^2 .

It is not a de Polignac number, because 77091957 - 2⁴ = 77091941 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77091907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 251782 + ... + 252087.

It is an arithmetic number, because the mean of its divisors is an integer number (9825465).

Almost surely, 2^77091957 is an apocalyptic number.

It is an amenable number.

77091957 is a deficient number, since it is larger than the sum of its proper divisors (40813623).

77091957 is a wasteful number, since it uses less digits than its factorization.

77091957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503892 (or 503889 counting only the distinct ones).

The product of its (nonzero) digits is 138915, while the sum is 45.

The square root of 77091957 is about 8780.2025603058. The cubic root of 77091957 is about 425.6013761009.

The spelling of 77091957 in words is "seventy-seven million, ninety-one thousand, nine hundred fifty-seven".