620742787 has 32 divisors (see below), whose sum is σ = 762577920. Its totient is φ = 493516800.

The previous prime is 620742781. The next prime is 620742809. The reversal of 620742787 is 787247026.

It is not a de Polignac number, because 620742787 - 2³ = 620742779 is a prime.

It is a super-2 number, since 2×620742787² = 770643215225054738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (620742781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1547787 + ... + 1548187.

It is an arithmetic number, because the mean of its divisors is an integer number (23830560).

Almost surely, 2^620742787 is an apocalyptic number.

620742787 is a deficient number, since it is larger than the sum of its proper divisors (141835133).

620742787 is a wasteful number, since it uses less digits than its factorization.

620742787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643.

The product of its (nonzero) digits is 263424, while the sum is 43.

The square root of 620742787 is about 24914.7102531818. The cubic root of 620742787 is about 853.0422871001.

The spelling of 620742787 in words is "six hundred twenty million, seven hundred forty-two thousand, seven hundred eighty-seven".