62778561 has 4 divisors (see below), whose sum is σ = 83704752. Its totient is φ = 41852372.

The previous prime is 62778559. The next prime is 62778563. The reversal of 62778561 is 16587726.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (62778559) and next prime (62778563).

It is a cyclic number.

It is not a de Polignac number, because 62778561 - 2¹ = 62778559 is a prime.

It is a super-2 number, since 2×62778561² = 7882295442461442, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (62778563) 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, 10463091 + ... + 10463096.

It is an arithmetic number, because the mean of its divisors is an integer number (20926188).

Almost surely, 2^62778561 is an apocalyptic number.

It is an amenable number.

62778561 is a deficient number, since it is larger than the sum of its proper divisors (20926191).

62778561 is a wasteful number, since it uses less digits than its factorization.

62778561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20926190.

The product of its digits is 141120, while the sum is 42.

The square root of 62778561 is about 7923.2923081255. The cubic root of 62778561 is about 397.4389732664.

The spelling of 62778561 in words is "sixty-two million, seven hundred seventy-eight thousand, five hundred sixty-one".