77777740 has 12 divisors (see below), whose sum is σ = 163333296. Its totient is φ = 31111088.

The previous prime is 77777719. The next prime is 77777747. The reversal of 77777740 is 4777777.

It is a happy number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (77777747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1944424 + ... + 1944463.

It is an arithmetic number, because the mean of its divisors is an integer number (13611108).

Almost surely, 2^77777740 is an apocalyptic number.

It is an amenable number.

77777740 is an abundant number, since it is smaller than the sum of its proper divisors (85555556).

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

77777740 is a wasteful number, since it uses less digits than its factorization.

77777740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888896 (or 3888894 counting only the distinct ones).

The product of its (nonzero) digits is 470596, while the sum is 46.

The square root of 77777740 is about 8819.1688950830. The cubic root of 77777740 is about 426.8596525519.

The spelling of 77777740 in words is "seventy-seven million, seven hundred seventy-seven thousand, seven hundred forty".