77997404 has 6 divisors (see below), whose sum is σ = 136495464. Its totient is φ = 38998700.

The previous prime is 77997401. The next prime is 77997421. The reversal of 77997404 is 40479977.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77997401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9749672 + ... + 9749679.

It is an arithmetic number, because the mean of its divisors is an integer number (22749244).

Almost surely, 2^77997404 is an apocalyptic number.

It is an amenable number.

77997404 is a deficient number, since it is larger than the sum of its proper divisors (58498060).

77997404 is a wasteful number, since it uses less digits than its factorization.

77997404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19499355 (or 19499353 counting only the distinct ones).

The product of its (nonzero) digits is 444528, while the sum is 47.

The square root of 77997404 is about 8831.6138955459. The cubic root of 77997404 is about 427.2611280224.

The spelling of 77997404 in words is "seventy-seven million, nine hundred ninety-seven thousand, four hundred four".