620739987 has 12 divisors (see below), whose sum is σ = 962780616. Its totient is φ = 354708480.

The previous prime is 620739979. The next prime is 620740027. The reversal of 620739987 is 789937026.

It is not a de Polignac number, because 620739987 - 2³ = 620739979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (620739907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2111214 + ... + 2111507.

It is an arithmetic number, because the mean of its divisors is an integer number (80231718).

Almost surely, 2^620739987 is an apocalyptic number.

620739987 is a deficient number, since it is larger than the sum of its proper divisors (342040629).

620739987 is a wasteful number, since it uses less digits than its factorization.

620739987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4222738 (or 4222731 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 51.

The square root of 620739987 is about 24914.6540614153. The cubic root of 620739987 is about 853.0410044852.

The spelling of 620739987 in words is "six hundred twenty million, seven hundred thirty-nine thousand, nine hundred eighty-seven".