620977491 has 12 divisors (see below), whose sum is σ = 917827768. Its totient is φ = 404357184.

The previous prime is 620977471. The next prime is 620977501. The reversal of 620977491 is 194779026.

It is not a de Polignac number, because 620977491 - 2⁵ = 620977459 is a prime.

It is a super-2 number, since 2×620977491² = 771226088657310162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620977451) 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, 801910 + ... + 802683.

Almost surely, 2^620977491 is an apocalyptic number.

620977491 is a deficient number, since it is larger than the sum of its proper divisors (296850277).

620977491 is a wasteful number, since it uses less digits than its factorization.

620977491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604642 (or 1604639 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 620977491 is about 24919.4199571338. The cubic root of 620977491 is about 853.1497858435.

The spelling of 620977491 in words is "six hundred twenty million, nine hundred seventy-seven thousand, four hundred ninety-one".