77337142978 has 8 divisors (see below), whose sum is σ = 116006915772. Its totient is φ = 38668171056.

The previous prime is 77337142963. The next prime is 77337142979. The reversal of 77337142978 is 87924173377.

It can be written as a sum of positive squares in 2 ways, for example, as 63591221929 + 13745921049 = 252173^2 + 117243^2 .

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

It is a super-2 number, since 2×77337142978² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77337142979) 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, 206176 + ... + 444052.

Almost surely, 2^77337142978 is an apocalyptic number.

77337142978 is a deficient number, since it is larger than the sum of its proper divisors (38669772794).

77337142978 is a wasteful number, since it uses less digits than its factorization.

77337142978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400436.

The product of its digits is 12446784, while the sum is 58.

The spelling of 77337142978 in words is "seventy-seven billion, three hundred thirty-seven million, one hundred forty-two thousand, nine hundred seventy-eight".