761420621 has 4 divisors (see below), whose sum is σ = 819991452. Its totient is φ = 702849792.

The previous prime is 761420591. The next prime is 761420677. The reversal of 761420621 is 126024167.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126024167 = 2657 ⋅47431.

It can be written as a sum of positive squares in 2 ways, for example, as 103754596 + 657666025 = 10186^2 + 25645^2 .

It is a cyclic number.

It is not a de Polignac number, because 761420621 - 2¹⁸ = 761158477 is a prime.

It is a super-2 number, since 2×761420621² = 1159522724168051282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (761428621) 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, 29285396 + ... + 29285421.

It is an arithmetic number, because the mean of its divisors is an integer number (204997863).

Almost surely, 2^761420621 is an apocalyptic number.

It is an amenable number.

761420621 is a deficient number, since it is larger than the sum of its proper divisors (58570831).

761420621 is a wasteful number, since it uses less digits than its factorization.

761420621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58570830.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 761420621 is about 27593.8511447750. The cubic root of 761420621 is about 913.1487832701.

Adding to 761420621 its reverse (126024167), we get a palindrome (887444788).

The spelling of 761420621 in words is "seven hundred sixty-one million, four hundred twenty thousand, six hundred twenty-one".