620978487 has 4 divisors (see below), whose sum is σ = 827971320. Its totient is φ = 413985656.

The previous prime is 620978471. The next prime is 620978507. The reversal of 620978487 is 784879026.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 620978487 - 2⁴ = 620978471 is a prime.

It is a super-2 number, since 2×620978487² = 771228562633618338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620978467) 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 3 ways as a sum of consecutive naturals, for example, 103496412 + ... + 103496417.

It is an arithmetic number, because the mean of its divisors is an integer number (206992830).

Almost surely, 2^620978487 is an apocalyptic number.

620978487 is a deficient number, since it is larger than the sum of its proper divisors (206992833).

620978487 is a wasteful number, since it uses less digits than its factorization.

620978487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206992832.

The product of its (nonzero) digits is 1354752, while the sum is 51.

The square root of 620978487 is about 24919.4399415396. The cubic root of 620978487 is about 853.1502419721.

The spelling of 620978487 in words is "six hundred twenty million, nine hundred seventy-eight thousand, four hundred eighty-seven".