77901242 has 8 divisors (see below), whose sum is σ = 123725556. Its totient is φ = 36659392.

The previous prime is 77901217. The next prime is 77901247. The reversal of 77901242 is 24210977.

It can be written as a sum of positive squares in 2 ways, for example, as 63377521 + 14523721 = 7961^2 + 3811^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 77901199 and 77901208.

It is not an unprimeable number, because it can be changed into a prime (77901247) 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, 1145573 + ... + 1145640.

Almost surely, 2^77901242 is an apocalyptic number.

77901242 is a deficient number, since it is larger than the sum of its proper divisors (45824314).

77901242 is a wasteful number, since it uses less digits than its factorization.

77901242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291232.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 77901242 is about 8826.1680246866. The cubic root of 77901242 is about 427.0854675560.

The spelling of 77901242 in words is "seventy-seven million, nine hundred one thousand, two hundred forty-two".