77954 has 4 divisors (see below), whose sum is σ = 116934. Its totient is φ = 38976.

The previous prime is 77951. The next prime is 77969. The reversal of 77954 is 45977.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45977 = 23 ⋅1999.

It can be written as a sum of positive squares in only one way, i.e., 76729 + 1225 = 277^2 + 35^2 .

It is a super-2 number, since 2×77954² = 12153652232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77954.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19487 + ... + 19490.

2⁷⁷⁹⁵⁴ is an apocalyptic number.

77954 is a deficient number, since it is larger than the sum of its proper divisors (38980).

77954 is a wasteful number, since it uses less digits than its factorization.

77954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38979.

The product of its digits is 8820, while the sum is 32.

The square root of 77954 is about 279.2024355195. The cubic root of 77954 is about 42.7181859217.

The spelling of 77954 in words is "seventy-seven thousand, nine hundred fifty-four".