77938477 has 4 divisors (see below), whose sum is σ = 78925120. Its totient is φ = 76951836.

The previous prime is 77938463. The next prime is 77938543. The reversal of 77938477 is 77483977.

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, and also an emirpimes, since its reverse is a distinct semiprime: 77483977 = 17 ⋅4557881.

It is a cyclic number.

It is not a de Polignac number, because 77938477 - 2²³ = 69549869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77933477) 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, 493203 + ... + 493360.

It is an arithmetic number, because the mean of its divisors is an integer number (19731280).

Almost surely, 2^77938477 is an apocalyptic number.

It is an amenable number.

77938477 is a deficient number, since it is larger than the sum of its proper divisors (986643).

77938477 is an equidigital number, since it uses as much as digits as its factorization.

77938477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986642.

The product of its digits is 2074464, while the sum is 52.

The square root of 77938477 is about 8828.2771252380. The cubic root of 77938477 is about 427.1535023907.

The spelling of 77938477 in words is "seventy-seven million, nine hundred thirty-eight thousand, four hundred seventy-seven".