77428945 has 32 divisors (see below), whose sum is σ = 104509440. Its totient is φ = 54594240.

The previous prime is 77428943. The next prime is 77428969. The reversal of 77428945 is 54982477.

It is not a de Polignac number, because 77428945 - 2¹ = 77428943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77428895 and 77428904.

It is not an unprimeable number, because it can be changed into a prime (77428943) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 347104 + ... + 347326.

It is an arithmetic number, because the mean of its divisors is an integer number (3265920).

Almost surely, 2^77428945 is an apocalyptic number.

It is an amenable number.

77428945 is a deficient number, since it is larger than the sum of its proper divisors (27080495).

77428945 is a wasteful number, since it uses less digits than its factorization.

77428945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405.

The product of its digits is 564480, while the sum is 46.

The square root of 77428945 is about 8799.3718525813. The cubic root of 77428945 is about 426.2206109716.

The spelling of 77428945 in words is "seventy-seven million, four hundred twenty-eight thousand, nine hundred forty-five".