77572945 has 4 divisors (see below), whose sum is σ = 93087540. Its totient is φ = 62058352.

The previous prime is 77572933. The next prime is 77572987. The reversal of 77572945 is 54927577.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24690961 + 52881984 = 4969^2 + 7272^2 .

It is a cyclic number.

It is not a de Polignac number, because 77572945 - 2¹⁷ = 77441873 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77572895 and 77572904.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7757290 + ... + 7757299.

It is an arithmetic number, because the mean of its divisors is an integer number (23271885).

Almost surely, 2^77572945 is an apocalyptic number.

It is an amenable number.

77572945 is a deficient number, since it is larger than the sum of its proper divisors (15514595).

77572945 is a wasteful number, since it uses less digits than its factorization.

77572945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15514594.

The product of its digits is 617400, while the sum is 46.

The square root of 77572945 is about 8807.5504540139. The cubic root of 77572945 is about 426.4846713906.

The spelling of 77572945 in words is "seventy-seven million, five hundred seventy-two thousand, nine hundred forty-five".