77428658 has 4 divisors (see below), whose sum is σ = 116142990. Its totient is φ = 38714328.

The previous prime is 77428639. The next prime is 77428717. The reversal of 77428658 is 85682477.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85682477 = 83 ⋅1032319.

It can be written as a sum of positive squares in only one way, i.e., 48344209 + 29084449 = 6953^2 + 5393^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19357163 + ... + 19357166.

Almost surely, 2^77428658 is an apocalyptic number.

77428658 is a deficient number, since it is larger than the sum of its proper divisors (38714332).

77428658 is a wasteful number, since it uses less digits than its factorization.

77428658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38714331.

The product of its digits is 752640, while the sum is 47.

The square root of 77428658 is about 8799.3555445839. The cubic root of 77428658 is about 426.2200843577.

The spelling of 77428658 in words is "seventy-seven million, four hundred twenty-eight thousand, six hundred fifty-eight".