77120745 has 16 divisors (see below), whose sum is σ = 132885312. Its totient is φ = 37967040.

The previous prime is 77120741. The next prime is 77120779. The reversal of 77120745 is 54702177.

It is a happy number.

It is not a de Polignac number, because 77120745 - 2² = 77120741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77120741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197551 + ... + 197940.

It is an arithmetic number, because the mean of its divisors is an integer number (8305332).

Almost surely, 2^77120745 is an apocalyptic number.

It is an amenable number.

77120745 is a deficient number, since it is larger than the sum of its proper divisors (55764567).

77120745 is a wasteful number, since it uses less digits than its factorization.

77120745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395512.

The product of its (nonzero) digits is 13720, while the sum is 33.

The square root of 77120745 is about 8781.8417772128. The cubic root of 77120745 is about 425.6543461214.

The spelling of 77120745 in words is "seventy-seven million, one hundred twenty thousand, seven hundred forty-five".