77528042 has 4 divisors (see below), whose sum is σ = 116292066. Its totient is φ = 38764020.

The previous prime is 77528023. The next prime is 77528053. The reversal of 77528042 is 24082577.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24082577 = 4723 ⋅5099.

It can be written as a sum of positive squares in only one way, i.e., 47596201 + 29931841 = 6899^2 + 5471^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77527993 and 77528011.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19382009 + ... + 19382012.

Almost surely, 2^77528042 is an apocalyptic number.

77528042 is a deficient number, since it is larger than the sum of its proper divisors (38764024).

77528042 is a wasteful number, since it uses less digits than its factorization.

77528042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38764023.

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 77528042 is about 8805.0009653605. Note that the first 3 decimals coincide. The cubic root of 77528042 is about 426.4023654721.

The spelling of 77528042 in words is "seventy-seven million, five hundred twenty-eight thousand, forty-two".