77749945 has 32 divisors (see below), whose sum is σ = 115976448. Its totient is φ = 48722688.

The previous prime is 77749939. The next prime is 77749951. The reversal of 77749945 is 54994777.

It is an interprime number because it is at equal distance from previous prime (77749939) and next prime (77749951).

It is not a de Polignac number, because 77749945 - 2¹³ = 77741753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77749892 and 77749901.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47887 + ... + 49483.

It is an arithmetic number, because the mean of its divisors is an integer number (3624264).

Almost surely, 2^77749945 is an apocalyptic number.

It is an amenable number.

77749945 is a deficient number, since it is larger than the sum of its proper divisors (38226503).

77749945 is a wasteful number, since it uses less digits than its factorization.

77749945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1729.

The product of its digits is 2222640, while the sum is 52.

The square root of 77749945 is about 8817.5929255098. The cubic root of 77749945 is about 426.8087983372.

The spelling of 77749945 in words is "seventy-seven million, seven hundred forty-nine thousand, nine hundred forty-five".