77407421 has 8 divisors (see below), whose sum is σ = 95270784. Its totient is φ = 61245360.

The previous prime is 77407411. The next prime is 77407423. The reversal of 77407421 is 12470477.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77407421 - 2⁶ = 77407357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77407423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425225 + ... + 425406.

It is an arithmetic number, because the mean of its divisors is an integer number (11908848).

Almost surely, 2^77407421 is an apocalyptic number.

It is an amenable number.

77407421 is a deficient number, since it is larger than the sum of its proper divisors (17863363).

77407421 is a wasteful number, since it uses less digits than its factorization.

77407421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850651.

The product of its (nonzero) digits is 10976, while the sum is 32.

The square root of 77407421 is about 8798.1487257263. The cubic root of 77407421 is about 426.1811131557.

Adding to 77407421 its reverse (12470477), we get a palindrome (89877898).

The spelling of 77407421 in words is "seventy-seven million, four hundred seven thousand, four hundred twenty-one".