67778990 has 16 divisors (see below), whose sum is σ = 122137200. Its totient is φ = 27081600.

The previous prime is 67778987. The next prime is 67778993. The reversal of 67778990 is 9987776.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (67778987) and next prime (67778993).

It is a super-5 number, since 5×67778990⁵ (a number of 40 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67778993) 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, 7286 + ... + 13734.

It is an arithmetic number, because the mean of its divisors is an integer number (7633575).

Almost surely, 2^67778990 is an apocalyptic number.

67778990 is a deficient number, since it is larger than the sum of its proper divisors (54358210).

67778990 is a wasteful number, since it uses less digits than its factorization.

67778990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7507.

The product of its (nonzero) digits is 1333584, while the sum is 53.

The square root of 67778990 is about 8232.7996453211. The cubic root of 67778990 is about 407.7228309431.

The spelling of 67778990 in words is "sixty-seven million, seven hundred seventy-eight thousand, nine hundred ninety".