77077940 has 24 divisors (see below), whose sum is σ = 167446440. Its totient is φ = 29767808.

The previous prime is 77077921. The next prime is 77077961. The reversal of 77077940 is 4977077.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25180324 + 51897616 = 5018^2 + 7204^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65867 + ... + 67026.

It is an arithmetic number, because the mean of its divisors is an integer number (6976935).

Almost surely, 2^77077940 is an apocalyptic number.

It is an amenable number.

77077940 is an abundant number, since it is smaller than the sum of its proper divisors (90368500).

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

77077940 is a wasteful number, since it uses less digits than its factorization.

77077940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132931 (or 132929 counting only the distinct ones).

The product of its (nonzero) digits is 86436, while the sum is 41.

The square root of 77077940 is about 8779.4043078104. The cubic root of 77077940 is about 425.5755799983.

The spelling of 77077940 in words is "seventy-seven million, seventy-seven thousand, nine hundred forty".