77238945 has 72 divisors (see below), whose sum is σ = 162616896. Its totient is φ = 33751872.

The previous prime is 77238923. The next prime is 77238961. The reversal of 77238945 is 54983277.

It is not a de Polignac number, because 77238945 - 2⁶ = 77238881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 77238945.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 49954 + ... + 51476.

It is an arithmetic number, because the mean of its divisors is an integer number (2258568).

Almost surely, 2^77238945 is an apocalyptic number.

It is an amenable number.

77238945 is an abundant number, since it is smaller than the sum of its proper divisors (85377951).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77238945 is a wasteful number, since it uses less digits than its factorization.

77238945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571 (or 1561 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 77238945 is about 8788.5689961449. The cubic root of 77238945 is about 425.8716964666.

The spelling of 77238945 in words is "seventy-seven million, two hundred thirty-eight thousand, nine hundred forty-five".