77428432 has 20 divisors (see below), whose sum is σ = 150453540. Its totient is φ = 38601728.

The previous prime is 77428409. The next prime is 77428433. The reversal of 77428432 is 23482477.

It can be written as a sum of positive squares in 2 ways, for example, as 50637456 + 26790976 = 7116^2 + 5176^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77428391 and 77428400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77428433) 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, 1207 + ... + 12502.

It is an arithmetic number, because the mean of its divisors is an integer number (7522677).

Almost surely, 2^77428432 is an apocalyptic number.

It is an amenable number.

77428432 is a deficient number, since it is larger than the sum of its proper divisors (73025108).

77428432 is a wasteful number, since it uses less digits than its factorization.

77428432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14070 (or 14064 counting only the distinct ones).

The product of its digits is 75264, while the sum is 37.

The square root of 77428432 is about 8799.3427027250. The cubic root of 77428432 is about 426.2196696713.

The spelling of 77428432 in words is "seventy-seven million, four hundred twenty-eight thousand, four hundred thirty-two".