77974452 has 18 divisors (see below), whose sum is σ = 197102178. Its totient is φ = 25991472.

The previous prime is 77974451. The next prime is 77974483. The reversal of 77974452 is 25447977.

It can be written as a sum of positive squares in only one way, i.e., 77898276 + 76176 = 8826^2 + 276^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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 junction number, because it is equal to n+sod(n) for n = 77974398 and 77974407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77974451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1082943 + ... + 1083014.

It is an arithmetic number, because the mean of its divisors is an integer number (10950121).

Almost surely, 2^77974452 is an apocalyptic number.

It is an amenable number.

77974452 is an abundant number, since it is smaller than the sum of its proper divisors (119127726).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77974452 is a wasteful number, since it uses less digits than its factorization.

77974452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165967 (or 2165962 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The square root of 77974452 is about 8830.3143771895. The cubic root of 77974452 is about 427.2192144074.

The spelling of 77974452 in words is "seventy-seven million, nine hundred seventy-four thousand, four hundred fifty-two".