73977777 has 12 divisors (see below), whose sum is σ = 107449524. Its totient is φ = 49044960.

The previous prime is 73977751. The next prime is 73977791. The reversal of 73977777 is 77777937.

It can be written as a sum of positive squares in 2 ways, for example, as 772641 + 73205136 = 879^2 + 8556^2 .

It is not a de Polignac number, because 73977777 - 2¹⁰ = 73976753 is a prime.

It is a super-2 number, since 2×73977777² = 10945422979723458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (73977737) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21078 + ... + 24335.

It is an arithmetic number, because the mean of its divisors is an integer number (8954127).

Almost surely, 2^73977777 is an apocalyptic number.

It is an amenable number.

73977777 is a deficient number, since it is larger than the sum of its proper divisors (33471747).

73977777 is a wasteful number, since it uses less digits than its factorization.

73977777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45600 (or 45597 counting only the distinct ones).

The product of its digits is 3176523, while the sum is 54.

The square root of 73977777 is about 8601.0334844134. The cubic root of 73977777 is about 419.7916143123.

The spelling of 73977777 in words is "seventy-three million, nine hundred seventy-seven thousand, seven hundred seventy-seven".