77842690 has 32 divisors (see below), whose sum is σ = 143688816. Its totient is φ = 30351360.

The previous prime is 77842679. The next prime is 77842691. The reversal of 77842690 is 9624877.

It can be written as a sum of positive squares in 8 ways, for example, as 8003241 + 69839449 = 2829^2 + 8357^2 .

It is a super-2 number, since 2×77842690² = 12118968772872200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77842691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101910 + ... + 102670.

Almost surely, 2^77842690 is an apocalyptic number.

77842690 is a deficient number, since it is larger than the sum of its proper divisors (65846126).

77842690 is a wasteful number, since it uses less digits than its factorization.

77842690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 77842690 is about 8822.8504464260. The cubic root of 77842690 is about 426.9784389839.

The spelling of 77842690 in words is "seventy-seven million, eight hundred forty-two thousand, six hundred ninety".