77487490 has 32 divisors (see below), whose sum is σ = 143804160. Its totient is φ = 30046464.

The previous prime is 77487481. The next prime is 77487497. The reversal of 77487490 is 9478477.

It is a super-2 number, since 2×77487490² = 12008622213000200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77487490.

It is not an unprimeable number, because it can be changed into a prime (77487497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52381 + ... + 53839.

It is an arithmetic number, because the mean of its divisors is an integer number (4493880).

Almost surely, 2^77487490 is an apocalyptic number.

77487490 is a deficient number, since it is larger than the sum of its proper divisors (66316670).

77487490 is a wasteful number, since it uses less digits than its factorization.

77487490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626.

The product of its (nonzero) digits is 395136, while the sum is 46.

The square root of 77487490 is about 8802.6978818996. The cubic root of 77487490 is about 426.3280074979.

It can be divided in two parts, 77487 and 490, that added together give a palindrome (77977).

The spelling of 77487490 in words is "seventy-seven million, four hundred eighty-seven thousand, four hundred ninety".